LCM for 15 and 30

What's the Least Common Multiple (LCM) of 15 and 30?

Answer: LCM of 15 and 30 is 30

(Thirty)

Finding LCM for 15 and 30 using GCF's of these numbers

The first method to find LCM for numbers 15 and 30 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 15 and 30 is 15, so

LCM = (15 × 30) ÷ 15

LCM = 450 ÷ 15

LCM = 30

Finding LCM for 15 and 30 by Listing Multiples

The second method to find LCM for numbers 15 and 30 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 15: 15, 30, 45, 60

Multiples of 30: 30, 60, 90, 120, 150, 180, 210, 240, 270, 300, 330, 360, 390, 420, 450, 480, 510, 540, 570, 600, 630, 660, 690, 720, 750, 780, 810, 840, 870, 900, 930, 960, 990, 1020, 1050, 1080, 1110, 1140, 1170, 1200, 1230, 1260, 1290, 1320, 1350, 1380, 1410, 1440, 1470, 1500, 1530, 1560, 1590, 1620, 1650, 1680, 1710, 1740, 1770, 1800, 1830, 1860, 1890, 1920, 1950, 1980, 2010, 2040, 2070, 2100, 2130, 2160, 2190, 2220, 2250, 2280, 2310, 2340, 2370, 2400, 2430, 2460, 2490, 2520, 2550, 2580, 2610, 2640, 2670, 2700, 2730, 2760, 2790, 2820, 2850, 2880, 2910, 2940, 2970, 3000, 3030, 3060, 3090, 3120, 3150, 3180, 3210, 3240, 3270, 3300, 3330, 3360, 3390, 3420, 3450, 3480, 3510, 3540, 3570, 3600, 3630, 3660, 3690, 3720, 3750, 3780, 3810, 3840, 3870, 3900, 3930, 3960, 3990, 4020, 4050, 4080, 4110, 4140, 4170, 4200, 4230, 4260, 4290, 4320, 4350, 4380, 4410, 4440, 4470, 4500, 4530, 4560, 4590, 4620, 4650, 4680, 4710, 4740, 4770, 4800, 4830, 4860, 4890, 4920, 4950, 4980, 5010, 5040, 5070, 5100, 5130, 5160, 5190, 5220, 5250, 5280, 5310, 5340, 5370, 5400, 5430, 5460, 5490, 5520, 5550, 5580, 5610, 5640, 5670, 5700, 5730, 5760, 5790, 5820, 5850, 5880, 5910, 5940, 5970, 6000, 6030, 6060, 6090, 6120, 6150, 6180, 6210, 6240, 6270, 6300, 6330, 6360, 6390, 6420, 6450, 6480, 6510, 6540, 6570, 6600, 6630, 6660, 6690, 6720, 6750, 6780, 6810, 6840, 6870, 6900, 6930, 6960, 6990, 7020, 7050, 7080, 7110, 7140, 7170, 7200, 7230, 7260, 7290, 7320, 7350, 7380, 7410, 7440, 7470, 7500, 7530, 7560, 7590, 7620, 7650, 7680, 7710, 7740, 7770, 7800, 7830, 7860, 7890, 7920, 7950, 7980, 8010, 8040, 8070, 8100, 8130, 8160, 8190, 8220, 8250, 8280, 8310, 8340, 8370, 8400, 8430, 8460, 8490, 8520, 8550, 8580, 8610, 8640, 8670, 8700, 8730, 8760, 8790, 8820, 8850, 8880, 8910, 8940, 8970, 9000, 9030, 9060, 9090, 9120, 9150, 9180, 9210, 9240, 9270, 9300, 9330, 9360, 9390, 9420, 9450, 9480, 9510, 9540, 9570, 9600, 9630, 9660, 9690, 9720, 9750, 9780, 9810, 9840, 9870, 9900, 9930, 9960, 9990, 10020, 10050, 10080, 10110, 10140, 10170, 10200, 10230, 10260, 10290, 10320, 10350, 10380, 10410, 10440, 10470, 10500, 10530, 10560, 10590, 10620, 10650, 10680, 10710, 10740, 10770, 10800, 10830, 10860, 10890, 10920, 10950, 10980, 11010, 11040, 11070, 11100, 11130, 11160, 11190, 11220, 11250, 11280, 11310, 11340, 11370, 11400, 11430, 11460, 11490, 11520, 11550, 11580, 11610, 11640, 11670, 11700, 11730, 11760, 11790, 11820, 11850, 11880, 11910, 11940, 11970, 12000, 12030, 12060, 12090, 12120, 12150, 12180, 12210, 12240, 12270, 12300, 12330, 12360, 12390, 12420, 12450, 12480, 12510, 12540, 12570, 12600, 12630, 12660, 12690, 12720, 12750, 12780, 12810, 12840, 12870, 12900, 12930, 12960, 12990, 13020, 13050, 13080, 13110, 13140, 13170, 13200, 13230, 13260, 13290, 13320, 13350, 13380, 13410, 13440, 13470, 13500, 13530, 13560, 13590, 13620, 13650, 13680, 13710, 13740, 13770, 13800, 13830, 13860, 13890, 13920, 13950, 13980, 14010, 14040, 14070, 14100, 14130, 14160, 14190, 14220, 14250, 14280, 14310, 14340, 14370, 14400, 14430, 14460, 14490, 14520, 14550, 14580, 14610, 14640, 14670, 14700, 14730, 14760, 14790, 14820, 14850, 14880, 14910, 14940, 14970, 15000, 15030, 15060, 15090, 15120, 15150, 15180, 15210, 15240, 15270, 15300, 15330, 15360, 15390, 15420, 15450, 15480, 15510, 15540, 15570, 15600, 15630, 15660, 15690, 15720, 15750, 15780, 15810, 15840, 15870, 15900, 15930, 15960, 15990, 16020, 16050, 16080, 16110, 16140, 16170, 16200, 16230, 16260, 16290, 16320, 16350, 16380, 16410, 16440, 16470, 16500, 16530, 16560, 16590, 16620, 16650, 16680, 16710, 16740, 16770, 16800, 16830, 16860, 16890, 16920, 16950, 16980, 17010, 17040, 17070, 17100, 17130, 17160, 17190, 17220, 17250, 17280, 17310, 17340, 17370, 17400, 17430, 17460, 17490, 17520, 17550, 17580, 17610, 17640, 17670, 17700, 17730, 17760, 17790, 17820, 17850, 17880, 17910, 17940, 17970, 18000, 18030, 18060, 18090, 18120, 18150, 18180, 18210, 18240, 18270, 18300, 18330, 18360, 18390, 18420, 18450, 18480, 18510, 18540, 18570, 18600, 18630, 18660, 18690, 18720, 18750, 18780, 18810, 18840, 18870, 18900, 18930, 18960, 18990, 19020, 19050, 19080, 19110, 19140, 19170, 19200, 19230, 19260, 19290, 19320, 19350, 19380, 19410, 19440, 19470, 19500, 19530, 19560, 19590, 19620, 19650, 19680, 19710, 19740, 19770, 19800, 19830, 19860, 19890, 19920, 19950, 19980, 20010, 20040, 20070, 20100, 20130, 20160, 20190, 20220, 20250, 20280, 20310, 20340, 20370, 20400, 20430, 20460, 20490, 20520, 20550, 20580, 20610, 20640, 20670, 20700, 20730, 20760, 20790, 20820, 20850, 20880, 20910, 20940, 20970, 21000, 21030, 21060, 21090, 21120, 21150, 21180, 21210, 21240, 21270, 21300, 21330, 21360, 21390, 21420, 21450, 21480, 21510, 21540, 21570, 21600, 21630, 21660, 21690, 21720, 21750, 21780, 21810, 21840, 21870, 21900, 21930, 21960, 21990, 22020, 22050, 22080, 22110, 22140, 22170, 22200, 22230, 22260, 22290, 22320, 22350, 22380, 22410, 22440, 22470, 22500, 22530, 22560, 22590, 22620, 22650, 22680, 22710, 22740, 22770, 22800, 22830, 22860, 22890, 22920, 22950, 22980, 23010, 23040, 23070, 23100, 23130, 23160, 23190, 23220, 23250, 23280, 23310, 23340, 23370, 23400, 23430, 23460, 23490, 23520, 23550, 23580, 23610, 23640, 23670, 23700, 23730, 23760, 23790, 23820, 23850, 23880, 23910, 23940, 23970, 24000, 24030, 24060, 24090, 24120, 24150, 24180, 24210, 24240, 24270, 24300, 24330, 24360, 24390, 24420, 24450, 24480, 24510, 24540, 24570, 24600, 24630, 24660, 24690, 24720, 24750, 24780, 24810, 24840, 24870, 24900, 24930, 24960, 24990, 25020, 25050, 25080, 25110, 25140, 25170, 25200, 25230, 25260, 25290, 25320, 25350, 25380, 25410, 25440, 25470, 25500, 25530, 25560, 25590, 25620, 25650, 25680, 25710, 25740, 25770, 25800, 25830, 25860, 25890, 25920, 25950, 25980, 26010, 26040, 26070, 26100, 26130, 26160, 26190, 26220, 26250, 26280, 26310, 26340, 26370, 26400, 26430, 26460, 26490, 26520, 26550, 26580, 26610, 26640, 26670, 26700, 26730, 26760, 26790, 26820, 26850, 26880, 26910, 26940, 26970, 27000, 27030, 27060, 27090, 27120, 27150, 27180, 27210, 27240, 27270, 27300, 27330, 27360, 27390, 27420, 27450, 27480, 27510, 27540, 27570, 27600, 27630, 27660, 27690, 27720, 27750, 27780, 27810, 27840, 27870, 27900, 27930, 27960, 27990, 28020, 28050, 28080, 28110, 28140, 28170, 28200, 28230, 28260, 28290, 28320, 28350, 28380, 28410, 28440, 28470, 28500, 28530, 28560, 28590, 28620, 28650, 28680, 28710, 28740, 28770, 28800, 28830, 28860, 28890, 28920, 28950, 28980, 29010, 29040, 29070, 29100, 29130, 29160, 29190, 29220, 29250, 29280, 29310, 29340, 29370, 29400, 29430, 29460, 29490, 29520, 29550, 29580, 29610, 29640, 29670, 29700, 29730, 29760, 29790, 29820, 29850, 29880, 29910, 29940, 29970, 30000, [...], 30

So the LCM for 15 and 30 is 30

Finding LCM for 15 and 30 by Prime Factorization

Another method to find LCM for numbers 15 and 30 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:

All Prime Factors of 15: 3, 5 (exponent form: 31, 51)

All Prime Factors of 30: 2, 3, 5 (exponent form: 21, 31, 51)

31 × 51 × 21 = 30

LCM Table

Number 1Number 2LCM
13030
23030
33030
430
530
630
730210
830
930
1030
1130330
1230
1330
1430
1530
1630
1730510
1830
1930570
2030
2130
2230
2330690
2430
2530
2630390
2730
2830
2930870
303030

About "Least Common Multiple" Calculator

This calculator will help you find the Least Common Multiple (LCM) of two numbers. For example, it can help you find out what's the Least Common Multiple (LCM) of 15 and 30? (The answer is: 30). Select the first number (e.g. '15') and the second number (e.g. '30'). After that hit the 'Calculate' button.
Least Common Multiple (LCM) also known as the Lowest Common Multiple or Smallest Common Multiple of 2 numbers - it is the smallest positive integer that is divisible by both numbers

FAQ

What's the Least Common Multiple (LCM) of 15 and 30?

LCM of 15 and 30 is 30