LCM for 39 and 78

The first method to find LCM for numbers 39 and 78 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 39 and 78 is 39, so

LCM = (39 × 78) ÷ 39

LCM = 3042 ÷ 39

LCM = 78

The second method to find LCM for numbers 39 and 78 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 39: 39, 78, 117, 156

Multiples of 78: 78, 156, 234, 312, 390, 468, 546, 624, 702, 780, 858, 936, 1014, 1092, 1170, 1248, 1326, 1404, 1482, 1560, 1638, 1716, 1794, 1872, 1950, 2028, 2106, 2184, 2262, 2340, 2418, 2496, 2574, 2652, 2730, 2808, 2886, 2964, 3042, 3120, 3198, 3276, 3354, 3432, 3510, 3588, 3666, 3744, 3822, 3900, 3978, 4056, 4134, 4212, 4290, 4368, 4446, 4524, 4602, 4680, 4758, 4836, 4914, 4992, 5070, 5148, 5226, 5304, 5382, 5460, 5538, 5616, 5694, 5772, 5850, 5928, 6006, 6084, 6162, 6240, 6318, 6396, 6474, 6552, 6630, 6708, 6786, 6864, 6942, 7020, 7098, 7176, 7254, 7332, 7410, 7488, 7566, 7644, 7722, 7800, 7878, 7956, 8034, 8112, 8190, 8268, 8346, 8424, 8502, 8580, 8658, 8736, 8814, 8892, 8970, 9048, 9126, 9204, 9282, 9360, 9438, 9516, 9594, 9672, 9750, 9828, 9906, 9984, 10062, 10140, 10218, 10296, 10374, 10452, 10530, 10608, 10686, 10764, 10842, 10920, 10998, 11076, 11154, 11232, 11310, 11388, 11466, 11544, 11622, 11700, 11778, 11856, 11934, 12012, 12090, 12168, 12246, 12324, 12402, 12480, 12558, 12636, 12714, 12792, 12870, 12948, 13026, 13104, 13182, 13260, 13338, 13416, 13494, 13572, 13650, 13728, 13806, 13884, 13962, 14040, 14118, 14196, 14274, 14352, 14430, 14508, 14586, 14664, 14742, 14820, 14898, 14976, 15054, 15132, 15210, 15288, 15366, 15444, 15522, 15600, 15678, 15756, 15834, 15912, 15990, 16068, 16146, 16224, 16302, 16380, 16458, 16536, 16614, 16692, 16770, 16848, 16926, 17004, 17082, 17160, 17238, 17316, 17394, 17472, 17550, 17628, 17706, 17784, 17862, 17940, 18018, 18096, 18174, 18252, 18330, 18408, 18486, 18564, 18642, 18720, 18798, 18876, 18954, 19032, 19110, 19188, 19266, 19344, 19422, 19500, 19578, 19656, 19734, 19812, 19890, 19968, 20046, 20124, 20202, 20280, 20358, 20436, 20514, 20592, 20670, 20748, 20826, 20904, 20982, 21060, 21138, 21216, 21294, 21372, 21450, 21528, 21606, 21684, 21762, 21840, 21918, 21996, 22074, 22152, 22230, 22308, 22386, 22464, 22542, 22620, 22698, 22776, 22854, 22932, 23010, 23088, 23166, 23244, 23322, 23400, 23478, 23556, 23634, 23712, 23790, 23868, 23946, 24024, 24102, 24180, 24258, 24336, 24414, 24492, 24570, 24648, 24726, 24804, 24882, 24960, 25038, 25116, 25194, 25272, 25350, 25428, 25506, 25584, 25662, 25740, 25818, 25896, 25974, 26052, 26130, 26208, 26286, 26364, 26442, 26520, 26598, 26676, 26754, 26832, 26910, 26988, 27066, 27144, 27222, 27300, 27378, 27456, 27534, 27612, 27690, 27768, 27846, 27924, 28002, 28080, 28158, 28236, 28314, 28392, 28470, 28548, 28626, 28704, 28782, 28860, 28938, 29016, 29094, 29172, 29250, 29328, 29406, 29484, 29562, 29640, 29718, 29796, 29874, 29952, 30030, 30108, 30186, 30264, 30342, 30420, 30498, 30576, 30654, 30732, 30810, 30888, 30966, 31044, 31122, 31200, 31278, 31356, 31434, 31512, 31590, 31668, 31746, 31824, 31902, 31980, 32058, 32136, 32214, 32292, 32370, 32448, 32526, 32604, 32682, 32760, 32838, 32916, 32994, 33072, 33150, 33228, 33306, 33384, 33462, 33540, 33618, 33696, 33774, 33852, 33930, 34008, 34086, 34164, 34242, 34320, 34398, 34476, 34554, 34632, 34710, 34788, 34866, 34944, 35022, 35100, 35178, 35256, 35334, 35412, 35490, 35568, 35646, 35724, 35802, 35880, 35958, 36036, 36114, 36192, 36270, 36348, 36426, 36504, 36582, 36660, 36738, 36816, 36894, 36972, 37050, 37128, 37206, 37284, 37362, 37440, 37518, 37596, 37674, 37752, 37830, 37908, 37986, 38064, 38142, 38220, 38298, 38376, 38454, 38532, 38610, 38688, 38766, 38844, 38922, 39000, 39078, 39156, 39234, 39312, 39390, 39468, 39546, 39624, 39702, 39780, 39858, 39936, 40014, 40092, 40170, 40248, 40326, 40404, 40482, 40560, 40638, 40716, 40794, 40872, 40950, 41028, 41106, 41184, 41262, 41340, 41418, 41496, 41574, 41652, 41730, 41808, 41886, 41964, 42042, 42120, 42198, 42276, 42354, 42432, 42510, 42588, 42666, 42744, 42822, 42900, 42978, 43056, 43134, 43212, 43290, 43368, 43446, 43524, 43602, 43680, 43758, 43836, 43914, 43992, 44070, 44148, 44226, 44304, 44382, 44460, 44538, 44616, 44694, 44772, 44850, 44928, 45006, 45084, 45162, 45240, 45318, 45396, 45474, 45552, 45630, 45708, 45786, 45864, 45942, 46020, 46098, 46176, 46254, 46332, 46410, 46488, 46566, 46644, 46722, 46800, 46878, 46956, 47034, 47112, 47190, 47268, 47346, 47424, 47502, 47580, 47658, 47736, 47814, 47892, 47970, 48048, 48126, 48204, 48282, 48360, 48438, 48516, 48594, 48672, 48750, 48828, 48906, 48984, 49062, 49140, 49218, 49296, 49374, 49452, 49530, 49608, 49686, 49764, 49842, 49920, 49998, 50076, 50154, 50232, 50310, 50388, 50466, 50544, 50622, 50700, 50778, 50856, 50934, 51012, 51090, 51168, 51246, 51324, 51402, 51480, 51558, 51636, 51714, 51792, 51870, 51948, 52026, 52104, 52182, 52260, 52338, 52416, 52494, 52572, 52650, 52728, 52806, 52884, 52962, 53040, 53118, 53196, 53274, 53352, 53430, 53508, 53586, 53664, 53742, 53820, 53898, 53976, 54054, 54132, 54210, 54288, 54366, 54444, 54522, 54600, 54678, 54756, 54834, 54912, 54990, 55068, 55146, 55224, 55302, 55380, 55458, 55536, 55614, 55692, 55770, 55848, 55926, 56004, 56082, 56160, 56238, 56316, 56394, 56472, 56550, 56628, 56706, 56784, 56862, 56940, 57018, 57096, 57174, 57252, 57330, 57408, 57486, 57564, 57642, 57720, 57798, 57876, 57954, 58032, 58110, 58188, 58266, 58344, 58422, 58500, 58578, 58656, 58734, 58812, 58890, 58968, 59046, 59124, 59202, 59280, 59358, 59436, 59514, 59592, 59670, 59748, 59826, 59904, 59982, 60060, 60138, 60216, 60294, 60372, 60450, 60528, 60606, 60684, 60762, 60840, 60918, 60996, 61074, 61152, 61230, 61308, 61386, 61464, 61542, 61620, 61698, 61776, 61854, 61932, 62010, 62088, 62166, 62244, 62322, 62400, 62478, 62556, 62634, 62712, 62790, 62868, 62946, 63024, 63102, 63180, 63258, 63336, 63414, 63492, 63570, 63648, 63726, 63804, 63882, 63960, 64038, 64116, 64194, 64272, 64350, 64428, 64506, 64584, 64662, 64740, 64818, 64896, 64974, 65052, 65130, 65208, 65286, 65364, 65442, 65520, 65598, 65676, 65754, 65832, 65910, 65988, 66066, 66144, 66222, 66300, 66378, 66456, 66534, 66612, 66690, 66768, 66846, 66924, 67002, 67080, 67158, 67236, 67314, 67392, 67470, 67548, 67626, 67704, 67782, 67860, 67938, 68016, 68094, 68172, 68250, 68328, 68406, 68484, 68562, 68640, 68718, 68796, 68874, 68952, 69030, 69108, 69186, 69264, 69342, 69420, 69498, 69576, 69654, 69732, 69810, 69888, 69966, 70044, 70122, 70200, 70278, 70356, 70434, 70512, 70590, 70668, 70746, 70824, 70902, 70980, 71058, 71136, 71214, 71292, 71370, 71448, 71526, 71604, 71682, 71760, 71838, 71916, 71994, 72072, 72150, 72228, 72306, 72384, 72462, 72540, 72618, 72696, 72774, 72852, 72930, 73008, 73086, 73164, 73242, 73320, 73398, 73476, 73554, 73632, 73710, 73788, 73866, 73944, 74022, 74100, 74178, 74256, 74334, 74412, 74490, 74568, 74646, 74724, 74802, 74880, 74958, 75036, 75114, 75192, 75270, 75348, 75426, 75504, 75582, 75660, 75738, 75816, 75894, 75972, 76050, 76128, 76206, 76284, 76362, 76440, 76518, 76596, 76674, 76752, 76830, 76908, 76986, 77064, 77142, 77220, 77298, 77376, 77454, 77532, 77610, 77688, 77766, 77844, 77922, 78000, [...], 78

So the LCM for 39 and 78 is 78

Another method to find LCM for numbers 39 and 78 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:

• What is the GCF of 39 and 78