JUSTICE McKINNON
delivered the Opinion of the Court.
¶1 Plaintiffs James Morrow, Tyrel Wermelskirchen, and Dustin Higgs, on behalf of others similarly situated, appeal the denial of their motion for class certification in the Eleventh Judicial District Court, Flathead County. We affirm.
¶2 The issue presented for review is whether the District Court abused its discretion when it denied class certification on the grounds that the proposed class was not sufficiently numerous.
FACTUAL AND PROCEDURAL BACKGROUND
¶3 Plaintiffs are laborers who worked on the construction and rehabilitation of two multi-family housing projects in Kalispell, known as Glacier Manor and Treasure State Plaza Apartments. The owner of the projects is Glacier States Associates, which hired Monfiic, Inc., as the general contractor. Monfiic hired subcontractors to perform all of the labor on the projects. Plaintiffs are employees of those subcontractors. The projects were financed with industrial development bonds issued by the City of Kalispell. A contractor on such a project is required by Montana law to pay prevailing wages. While the contract between Glacier States and Monfiic included a provision requiring Monfiic to pay prevailing wages, Plaintiffs claim that contracts between Monfiic and its subcontractors did not include that requirement. Plaintiffs claim they were not paid prevailing wages.
¶4 Plaintiffs filed this wage and hour action and moved for certification of a proposed class including all laborers, skilled tradesmen, and craftsmen who worked for Monfiic or its subcontractors and who were not paid prevailing wages during the construction and rehabilitation of Glacier Manor and Treasure State Plaza. Plaintiffs identified 28 persons they claim were underpaid on the projects, seven of whom were named plaintiffs and class representatives. Monfiic objected to the inclusion of four class members, contending that they were not laborers. The class members [60]*60not joined in the action thus numbered between 17 and 21.
¶5 A hearing was held on the motion for class certification on May 29, 2014. The District Court asked counsel for Plaintiffs why the remaining 17 to 21 individuals could not simply be joined as parties. Counsel responded, “I can try to do that. I didn’t have their names... and I don’t have all their addresses.” The District Court observed that the proposed class was “a relatively small group of... local employees, although I suppose if this work happened... prior to 2008 anyway that they’re probably all over in North Dakota now.” Following the hearing, the District Court issued an order denying the motion for class certification, concluding that the class was not so numerous that joining its members as named parties would be impracticable. The District Court also observed that certification of a class would not result in a more efficient use of judicial resources. The District Court concluded that because Plaintiffs had failed to demonstrate numerosity of the proposed class, it did not need to consider other factors.
STANDARD OF REVIEW
¶6 We afford district courts the broadest discretion when reviewing a decision on class certification. Jacobsen v. Allstate Ins. Co., 2013 MT 244, ¶ 25, 371 Mont. 393, 310 P.3d 452. The district court “ ‘is in the best position to consider the most fair and efficient procedure for conducting any given litigation.’ ” Jacobsen, ¶ 25 (quoting Chipman v. Nw. Healthcare Corp., 2012 MT 242, ¶ 17, 366 Mont. 450, 288 P.3d 193). To the extent that a ruling on class certification is based on a finding of fact, we review that finding for clear error. Mattson v. Mont. Power Co., 2012 MT 318, ¶ 17, 368 Mont. 1, 291 P.3d 1209. When the ruling involves a question of law, our review is de novo. Mattson, ¶ 17.
DISCUSSION
¶7 Whether the District Court abused its discretion when it denied class certification on the grounds that the proposed class was not sufficiently numerous.
¶8 A class action allows representative parties to bring claims on behalf of others similarly situated, with the aim of conserving the resources of both the court and the parties by permitting common issues to be litigated at once. Gen. Tel. Co. of the Sw. v. Falcon, 457 U.S. 147, 155, 102 S. Ct. 2364, 2369 (1982) (citing Califano v. Yamasaki, 442 U.S. 682, 700-01, 99 S. Ct. 2545, 2557 (1979)). As such, a class action is “ ‘an exception to the usual rule that litigation is conducted by and on behalf of the individual named parties only.’ ” [61]*61Mattson, ¶ 18 (quoting Califano, 442 U.S. at 700-01,99 S. Ct. at 2557). M. R. Civ. P. 23 governs the propriety of class actions in Montana and prescribes four prerequisites, each of which must be demonstrated before the class may be certified:
(1) the class is so numerous that joinder of all members is impracticable;
(2) there are questions of law or fact common to the class;
(3) the claims or defenses of the representative parties are typical of the claims or defenses of the class; and
(4) the representative parties will fairly and adequately protect the interests of the class.
These factors are often referred to as numerosity, commonality, typicality, and adequacy of representation. Mattson, ¶ 18 (citing Diaz v. Blue Cross & Blue Shield of Mont., 2011 MT 322, ¶ 27, 363 Mont. 151, 267 P.3d 756). The party seeking class certification bears the burden of demonstrating each of these factors. Diaz, ¶ 27. The failure to satisfy any one of these prerequisites is fatal to class certification. Diaz, ¶ 27. Because M. R. Civ. P. 23 corresponds to Fed. R. Civ. P. 23, we may look to federal case law for guidance in interpretation. Chipman, ¶ 43.
¶9 There is no hright-line number of class members that will establish numerosity. Instead, the numerosity of the class and impracticability of joinder must be determined on a case by case basis, with consideration given to all of the surrounding circumstances. Gen. Tel. Co. of the Nw. v. E.E.O.C., 446 U.S. 318, 330, 100 S. Ct. 1698, 1706 (1980); Odom v. Hazen Transp., Inc., 275 F.R.D. 400, 407 (W.D.N.Y. 2011). The United States Supreme Court has observed, however, that “as few as 15 employees” would likely “be too small to meet the numerosity requirement.” Gen. Tel. Co. of the Nw., 446 U.S. at 330, 100 S. Ct. at 1706; 1 Alba Conte & Herbert B. Newberg, Newberg on Class Actions § 3:5, 247 (4th ed. 2002). Generally, fewer than 21 potential class members is regarded as inadequate, while more than 40 is likely to be sufficient. Cox v. Am. Cast Iron Pipe Co., 784 F.2d 1546, 1553 (11th Cir. 1986); 2 James Wm. Moore, Allan D. Vestal & Philip B. Kurland, Moore’s Manual: Federal Practice and Procedure § 14A.22 (2014).
¶10 Where a class is small in number, other considerations become more significant in determining whether joinder is impracticable. Conte & Newberg, supra,
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JUSTICE McKINNON
delivered the Opinion of the Court.
¶1 Plaintiffs James Morrow, Tyrel Wermelskirchen, and Dustin Higgs, on behalf of others similarly situated, appeal the denial of their motion for class certification in the Eleventh Judicial District Court, Flathead County. We affirm.
¶2 The issue presented for review is whether the District Court abused its discretion when it denied class certification on the grounds that the proposed class was not sufficiently numerous.
FACTUAL AND PROCEDURAL BACKGROUND
¶3 Plaintiffs are laborers who worked on the construction and rehabilitation of two multi-family housing projects in Kalispell, known as Glacier Manor and Treasure State Plaza Apartments. The owner of the projects is Glacier States Associates, which hired Monfiic, Inc., as the general contractor. Monfiic hired subcontractors to perform all of the labor on the projects. Plaintiffs are employees of those subcontractors. The projects were financed with industrial development bonds issued by the City of Kalispell. A contractor on such a project is required by Montana law to pay prevailing wages. While the contract between Glacier States and Monfiic included a provision requiring Monfiic to pay prevailing wages, Plaintiffs claim that contracts between Monfiic and its subcontractors did not include that requirement. Plaintiffs claim they were not paid prevailing wages.
¶4 Plaintiffs filed this wage and hour action and moved for certification of a proposed class including all laborers, skilled tradesmen, and craftsmen who worked for Monfiic or its subcontractors and who were not paid prevailing wages during the construction and rehabilitation of Glacier Manor and Treasure State Plaza. Plaintiffs identified 28 persons they claim were underpaid on the projects, seven of whom were named plaintiffs and class representatives. Monfiic objected to the inclusion of four class members, contending that they were not laborers. The class members [60]*60not joined in the action thus numbered between 17 and 21.
¶5 A hearing was held on the motion for class certification on May 29, 2014. The District Court asked counsel for Plaintiffs why the remaining 17 to 21 individuals could not simply be joined as parties. Counsel responded, “I can try to do that. I didn’t have their names... and I don’t have all their addresses.” The District Court observed that the proposed class was “a relatively small group of... local employees, although I suppose if this work happened... prior to 2008 anyway that they’re probably all over in North Dakota now.” Following the hearing, the District Court issued an order denying the motion for class certification, concluding that the class was not so numerous that joining its members as named parties would be impracticable. The District Court also observed that certification of a class would not result in a more efficient use of judicial resources. The District Court concluded that because Plaintiffs had failed to demonstrate numerosity of the proposed class, it did not need to consider other factors.
STANDARD OF REVIEW
¶6 We afford district courts the broadest discretion when reviewing a decision on class certification. Jacobsen v. Allstate Ins. Co., 2013 MT 244, ¶ 25, 371 Mont. 393, 310 P.3d 452. The district court “ ‘is in the best position to consider the most fair and efficient procedure for conducting any given litigation.’ ” Jacobsen, ¶ 25 (quoting Chipman v. Nw. Healthcare Corp., 2012 MT 242, ¶ 17, 366 Mont. 450, 288 P.3d 193). To the extent that a ruling on class certification is based on a finding of fact, we review that finding for clear error. Mattson v. Mont. Power Co., 2012 MT 318, ¶ 17, 368 Mont. 1, 291 P.3d 1209. When the ruling involves a question of law, our review is de novo. Mattson, ¶ 17.
DISCUSSION
¶7 Whether the District Court abused its discretion when it denied class certification on the grounds that the proposed class was not sufficiently numerous.
¶8 A class action allows representative parties to bring claims on behalf of others similarly situated, with the aim of conserving the resources of both the court and the parties by permitting common issues to be litigated at once. Gen. Tel. Co. of the Sw. v. Falcon, 457 U.S. 147, 155, 102 S. Ct. 2364, 2369 (1982) (citing Califano v. Yamasaki, 442 U.S. 682, 700-01, 99 S. Ct. 2545, 2557 (1979)). As such, a class action is “ ‘an exception to the usual rule that litigation is conducted by and on behalf of the individual named parties only.’ ” [61]*61Mattson, ¶ 18 (quoting Califano, 442 U.S. at 700-01,99 S. Ct. at 2557). M. R. Civ. P. 23 governs the propriety of class actions in Montana and prescribes four prerequisites, each of which must be demonstrated before the class may be certified:
(1) the class is so numerous that joinder of all members is impracticable;
(2) there are questions of law or fact common to the class;
(3) the claims or defenses of the representative parties are typical of the claims or defenses of the class; and
(4) the representative parties will fairly and adequately protect the interests of the class.
These factors are often referred to as numerosity, commonality, typicality, and adequacy of representation. Mattson, ¶ 18 (citing Diaz v. Blue Cross & Blue Shield of Mont., 2011 MT 322, ¶ 27, 363 Mont. 151, 267 P.3d 756). The party seeking class certification bears the burden of demonstrating each of these factors. Diaz, ¶ 27. The failure to satisfy any one of these prerequisites is fatal to class certification. Diaz, ¶ 27. Because M. R. Civ. P. 23 corresponds to Fed. R. Civ. P. 23, we may look to federal case law for guidance in interpretation. Chipman, ¶ 43.
¶9 There is no hright-line number of class members that will establish numerosity. Instead, the numerosity of the class and impracticability of joinder must be determined on a case by case basis, with consideration given to all of the surrounding circumstances. Gen. Tel. Co. of the Nw. v. E.E.O.C., 446 U.S. 318, 330, 100 S. Ct. 1698, 1706 (1980); Odom v. Hazen Transp., Inc., 275 F.R.D. 400, 407 (W.D.N.Y. 2011). The United States Supreme Court has observed, however, that “as few as 15 employees” would likely “be too small to meet the numerosity requirement.” Gen. Tel. Co. of the Nw., 446 U.S. at 330, 100 S. Ct. at 1706; 1 Alba Conte & Herbert B. Newberg, Newberg on Class Actions § 3:5, 247 (4th ed. 2002). Generally, fewer than 21 potential class members is regarded as inadequate, while more than 40 is likely to be sufficient. Cox v. Am. Cast Iron Pipe Co., 784 F.2d 1546, 1553 (11th Cir. 1986); 2 James Wm. Moore, Allan D. Vestal & Philip B. Kurland, Moore’s Manual: Federal Practice and Procedure § 14A.22 (2014).
¶10 Where a class is small in number, other considerations become more significant in determining whether joinder is impracticable. Conte & Newberg, supra, §§ 3:3, at 225,3:6, at 249-53. Considerations recognized by other courts have included “judicial economy arising from the avoidance of a multiplicity of actions, geographic dispersion [62]*62of class members, financial resources of class members, the ability of claimants to institute individual suits, and requests for prospective injunctive relief which would involve future class members.” Robidoux v. Celani, 987 F.2d 931, 936 (2d. Cir. 1993); Conte & Newberg, supra, § 3:6, at 250-52. While each of these factors may be relevant to the question of class certification as a whole, this Court has not yet recognized their applicability to the narrower issue of numerosify. The party seeking certification bears the burden of making a factual showing demonstrating both the approximate number of class members and the impracticability of joinder. Diaz, ¶ 27. Mere speculation or conclusory allegations are not sufficient. Diaz, ¶ 31 (quoting Polich v. Burlington N., Inc., 116 F.R.D. 258, 261 (D. Mont. 1987)); Moore et al., supra, § 14A.22. Plaintiffs must actually prove that they have satisfied the prerequisites for class certification. Sangwin v. State, 2013 MT 373, ¶ 15, 373 Mont. 131, 315 P.3d 279. A court may not simply take their allegations as true nor presume their compliance with the requirements of M. R. Civ. P. 23(a). Sangwin, ¶ 15; Mattson, ¶ 15.
¶11 The proposed class in this case includes 24 to 28 persons, seven of whom are named plaintiffs and class representatives. This is near the number below which class certification is likely to be considered inappropriate. Gen. Tel. Co. of the Nw., 446 U.S. at 330, 100 S. Ct. at 1706; Cox, 784 F.2d at 1553; Conte & Newberg, supra, § 3:5, 247; Moore et al., supra, § 14A.22. The relatively small number of the proposed class is not dispositive, and indeed, courts may reasonably reach differing conclusions as to the propriety of certifying a class this size. In such circumstances, we defer to the District Court’s broad discretion in determining whether a class action is “ ‘the most fair and efficient procedure for conducting’ ” the litigation. Jacobsen, ¶ 25 (quoting Chipman, ¶ 17). We cannot conclude that the District Court abused that discretion here.
¶12 When a class is relatively small, however, a court must also examine other factors and circumstances that may make joinder impracticable. Gen. Tel. Co. of the Nw., 446 U.S. at 330, 100 S. Ct. at 1706; Odom, 275 F.R.D. at 407. The additional factors to be considered are flexible, and the impracticability of joinder must be determined on a case by case basis, with consideration given to all of the surrounding circumstances. Odom, 275 F.R.D. at 407. In this case, Plaintiffs raise four such circumstances: the geographic dispersion of proposed class members; the limited financial resources of proposed class members; the impracticability of litigatingtheir “relatively small” claims; and the [63]*63interests of judicial economy.1 The consideration of these factors remains within the broad discretion of the district court. Jacobsen, ¶ 25. The exercise of that discretion is nevertheless bound by the applicable law, and must avoid arbitraiy or unreasonable results. Diaz v. State, 2013 MT219, ¶ 15, 371 Mont. 214, 308 P.3d 38; Peterson v. St. Paul Fire & Marine Ins. Co., 2010 MT 187, ¶ 45, 357 Mont. 293, 239 P.3d 904. Thus, our discussion is not resolved by reference to the standard of review alone, and we offer guidance on the district court’s exercise of its discretion where appropriate. See Maloney v. Home & Inv. Ctr., Inc., 2000 MT 34, ¶ 57, 298 Mont. 213, 994 P.2d 1124.
¶13 We first address the alleged geographic dispersion of the proposed class members. If the proposed class members are not found within the same jurisdiction, the impracticability of joinder is increased. Monterrubio v. Best Buy Stores, L.P., 291 F.R.D. 443, 449 (E.D. Cal. 2013) (citing Riordan v. Smith Barney, 113 F.R.D. 60, 62 (N.D. Ill. 1986)). Plaintiffs argue that there is no evidence the proposed class members still reside in the Kalispell area, and ask the Court to take judicial notice of the fact that many Montana laborers work in the oil fields of North Dakota. Plaintiffs have offered no evidence suggesting that the laborers who worked on the Monfiic projects have left the Kalispell area. Indeed, at the hearing on Plaintiffs’ motion for class certification, it was made clear that counsel had not attempted to locate the remaining proposed class members, and the idea that they may have left for North Dakota was based entirely on an off-the-cuff suggestion by the District Court. Plaintiffs have not produced facts in support of their argument that the geographical dispersion of the [64]*64proposed class members makes their joinder in a single action impracticable. The District Court did not abuse its discretion when it concluded that joinder was not impracticable because the proposed class members were in the same geographic area.
¶14 Plaintiffs point to their allegedly limited financial means, the “relatively small” size of their claims, and the interests of judicial economy to demonstrate that individual suits would be impracticable. The question we address with respect to numerosity of the class, however, is not whether individual suits would be impracticable, but whether joinder of the proposed class members in a single suit would be impracticable. M. R. Civ. P. 23(aXl). Indeed, although this prerequisite is often conveniently referred to as “numerosity,” it is more accurately termed “impracticability of joinder.” See Conte & Newberg, supra, § 3:6, at 250. Plaintiffs rely on Deposit Guaranty National Bank v. Roper, 445 U.S. 326, 339, 100 S. Ct. 1166, 1174 (1980), and subsequent cases for the proposition that “[w]here it is not economically feasible to obtain relief within the traditional framework of a multiplicity of small individual suits for damages, aggrieved persons may be without any effective redress unless they may employ the class-action device.” This observation was not specific to the element of numerosity, but described the benefits of class-action litigation as a whole. Roper, 445 U.S. at 339, 100 S. Ct. at 1174. We agree that without the availability of a class action, aggrieved persons may be without any effective redress; however, aggrieved persons who are able to join their claims in a single action are not without effective redress, despite their small claims or limited resources. The requirement of numerosity under M. R. Civ. P. 23(a)(1) does not require a party to demonstrate the benefits of a single action; instead, it simply asks whether, under the circumstances of the particular case, joinder is a practicable alternative means of obtaining those benefits. The arguments raised by Plaintiffs, demonstrating the impracticability of individual actions, are of little relevance in demonstrating the impracticability of joinder.
¶15 The arguments raised by Plaintiffs may be relevant to other aspects of the class-certification inquiry. For example, M. R. Civ. P. 23(b)(1) asks whether adjudication of individual claims would create a risk of inconsistent results or lead to outcomes that may substantially impelir the ability of other proposed class members to protect their interests. M. R. Civ. P. 23(b)(3) asks whether “a class action is superior to other available methods for fairly and efficiently adjudicating the controversy.” A court does not reach the matters raised by M. R. Civ. P. 23(b), however, until the prerequisites of 23(a) have been satisfied. [65]*65Diaz, ¶ 27.
¶16 Because the District Court based its analysis of numerosity in part on these considerations, and because they have been recognized by other courts in the context of a numerosity analysis, see Robidoux, 987 F.2d at 936; Conte & Newberg, supra, § 3:6, at 250-52, we address them here. Plaintiffs first assert that the proposed class members are laborers of limited financial means, and therefore unable to prosecute their individual claims. The only evidence in the record pertaining to the financial means of the proposed class members are documents establishing the prevailing wages for laborers in 2008, as calculated by the Montana Department of Labor, and incomplete information regarding the wages paid by subcontractors on the Monfiic projects. There is no evidence establishing the current income or financial resources of the proposed class members. Having raised the argument that limitations on their financial resources prevent them from litigating their claims outside of a class action, Plaintiffs have nonetheless failed to offer facts supporting their argument. The District Court did not abuse its broad discretion when it determined class certification was not appropriate.
¶17 Plaintiffs also claim that the “relatively small” size of their claims makes individual litigation impracticable. The small size of individual claims may weigh in favor of class certification. For example, in a lawsuit where claims averaged $100 per plaintiff, the United States Supreme Court concluded that “most of the plaintiffs would have no realistic day in court if a class action were not available.” Phillips Petroleum Co. v. Shutts, 472 U.S. 797, 809, 105 S. Ct. 2965, 2973 (1985). Based on an analysis provided by Plaintiffs, their individual claims range from approximately $300 to $3,800. Though the value of many of the claims is yet to be determined, the average claim appears likely to be in the area of $1,500. It is not unusual in Montana courts for parties to seek amounts comparable to Plaintiffs’ claims, particularly where, as here, they also request attorney’s fees. See, e.g., McDunn v. Arnold, 2013 MT 138, ¶¶ 7-9, 370 Mont. 270, 303 P.3d 1279 (affirming district court award of $1,444.66in damages and $20,697 for attorney’s fees and costs). There is no bright-line value of claims that will make class certification appropriate, just as there is no bright-line number of prospective class members that will do so. See Gen. Tel. Co. of the Nw., 446 U.S. at 330, 100 S. Ct. at 1706. We allow district courts broad discretion in determining whether class certification is appropriate, Jacobsen, ¶ 25, and the District Court did not abuse its discretion here.
[66]*66¶18 Plaintiffs also argue that class-action certification would promote judicial economy by resolving their claims in one action, rather than several. The District Court concluded that the eventual necessity of determining the type of labor performed by each individual, the number of hours worked by each individual, the prevailing wage for that type of labor, and the actual wage paid to that individual would outweigh the efficiency benefits of a class action. We defer to the discretion of the District Court in determining “ ‘the most fair and efficient procedure for conducting any given litigation.’ ” Jacobsen, ¶ 25 (quoting Chipman, ¶ 17). We also observe, once again, that while a class action may be more efficient than several individual actions, it is not more efficient than joinder of the parties where practicable. Here, it was not demonstrated that joinder was impracticable. Instead, it was established that counsel had made no efforts to join the remaining proposed class members in the action. Consequently, the District Court did not abuse its discretion when it determined that joinder was not impracticable and a class action was not the most efficient means of conducting the present litigation.
CONCLUSION
¶19 The District Court did not abuse its discretion when it concluded that Plaintiffs had failed to establish, as required by M. R. Civ. P. 23(a)(1), that their proposed class was so numerous as to make joinder of its remaining members in a single action impracticable. Plaintiffs’ failure to demonstrate this prerequisite was fatal to their motion for class certification.
¶20 Affirmed.
JUSTICES BAKER and RICE concur.