LCM for 4 and 8

The first method to find LCM for numbers 4 and 8 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 4 and 8 is 4, so

LCM = (4 × 8) ÷ 4

LCM = 32 ÷ 4

LCM = 8

The second method to find LCM for numbers 4 and 8 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 4: 4, 8, 12, 16

Multiples of 8: 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120, 128, 136, 144, 152, 160, 168, 176, 184, 192, 200, 208, 216, 224, 232, 240, 248, 256, 264, 272, 280, 288, 296, 304, 312, 320, 328, 336, 344, 352, 360, 368, 376, 384, 392, 400, 408, 416, 424, 432, 440, 448, 456, 464, 472, 480, 488, 496, 504, 512, 520, 528, 536, 544, 552, 560, 568, 576, 584, 592, 600, 608, 616, 624, 632, 640, 648, 656, 664, 672, 680, 688, 696, 704, 712, 720, 728, 736, 744, 752, 760, 768, 776, 784, 792, 800, 808, 816, 824, 832, 840, 848, 856, 864, 872, 880, 888, 896, 904, 912, 920, 928, 936, 944, 952, 960, 968, 976, 984, 992, 1000, 1008, 1016, 1024, 1032, 1040, 1048, 1056, 1064, 1072, 1080, 1088, 1096, 1104, 1112, 1120, 1128, 1136, 1144, 1152, 1160, 1168, 1176, 1184, 1192, 1200, 1208, 1216, 1224, 1232, 1240, 1248, 1256, 1264, 1272, 1280, 1288, 1296, 1304, 1312, 1320, 1328, 1336, 1344, 1352, 1360, 1368, 1376, 1384, 1392, 1400, 1408, 1416, 1424, 1432, 1440, 1448, 1456, 1464, 1472, 1480, 1488, 1496, 1504, 1512, 1520, 1528, 1536, 1544, 1552, 1560, 1568, 1576, 1584, 1592, 1600, 1608, 1616, 1624, 1632, 1640, 1648, 1656, 1664, 1672, 1680, 1688, 1696, 1704, 1712, 1720, 1728, 1736, 1744, 1752, 1760, 1768, 1776, 1784, 1792, 1800, 1808, 1816, 1824, 1832, 1840, 1848, 1856, 1864, 1872, 1880, 1888, 1896, 1904, 1912, 1920, 1928, 1936, 1944, 1952, 1960, 1968, 1976, 1984, 1992, 2000, 2008, 2016, 2024, 2032, 2040, 2048, 2056, 2064, 2072, 2080, 2088, 2096, 2104, 2112, 2120, 2128, 2136, 2144, 2152, 2160, 2168, 2176, 2184, 2192, 2200, 2208, 2216, 2224, 2232, 2240, 2248, 2256, 2264, 2272, 2280, 2288, 2296, 2304, 2312, 2320, 2328, 2336, 2344, 2352, 2360, 2368, 2376, 2384, 2392, 2400, 2408, 2416, 2424, 2432, 2440, 2448, 2456, 2464, 2472, 2480, 2488, 2496, 2504, 2512, 2520, 2528, 2536, 2544, 2552, 2560, 2568, 2576, 2584, 2592, 2600, 2608, 2616, 2624, 2632, 2640, 2648, 2656, 2664, 2672, 2680, 2688, 2696, 2704, 2712, 2720, 2728, 2736, 2744, 2752, 2760, 2768, 2776, 2784, 2792, 2800, 2808, 2816, 2824, 2832, 2840, 2848, 2856, 2864, 2872, 2880, 2888, 2896, 2904, 2912, 2920, 2928, 2936, 2944, 2952, 2960, 2968, 2976, 2984, 2992, 3000, 3008, 3016, 3024, 3032, 3040, 3048, 3056, 3064, 3072, 3080, 3088, 3096, 3104, 3112, 3120, 3128, 3136, 3144, 3152, 3160, 3168, 3176, 3184, 3192, 3200, 3208, 3216, 3224, 3232, 3240, 3248, 3256, 3264, 3272, 3280, 3288, 3296, 3304, 3312, 3320, 3328, 3336, 3344, 3352, 3360, 3368, 3376, 3384, 3392, 3400, 3408, 3416, 3424, 3432, 3440, 3448, 3456, 3464, 3472, 3480, 3488, 3496, 3504, 3512, 3520, 3528, 3536, 3544, 3552, 3560, 3568, 3576, 3584, 3592, 3600, 3608, 3616, 3624, 3632, 3640, 3648, 3656, 3664, 3672, 3680, 3688, 3696, 3704, 3712, 3720, 3728, 3736, 3744, 3752, 3760, 3768, 3776, 3784, 3792, 3800, 3808, 3816, 3824, 3832, 3840, 3848, 3856, 3864, 3872, 3880, 3888, 3896, 3904, 3912, 3920, 3928, 3936, 3944, 3952, 3960, 3968, 3976, 3984, 3992, 4000, 4008, 4016, 4024, 4032, 4040, 4048, 4056, 4064, 4072, 4080, 4088, 4096, 4104, 4112, 4120, 4128, 4136, 4144, 4152, 4160, 4168, 4176, 4184, 4192, 4200, 4208, 4216, 4224, 4232, 4240, 4248, 4256, 4264, 4272, 4280, 4288, 4296, 4304, 4312, 4320, 4328, 4336, 4344, 4352, 4360, 4368, 4376, 4384, 4392, 4400, 4408, 4416, 4424, 4432, 4440, 4448, 4456, 4464, 4472, 4480, 4488, 4496, 4504, 4512, 4520, 4528, 4536, 4544, 4552, 4560, 4568, 4576, 4584, 4592, 4600, 4608, 4616, 4624, 4632, 4640, 4648, 4656, 4664, 4672, 4680, 4688, 4696, 4704, 4712, 4720, 4728, 4736, 4744, 4752, 4760, 4768, 4776, 4784, 4792, 4800, 4808, 4816, 4824, 4832, 4840, 4848, 4856, 4864, 4872, 4880, 4888, 4896, 4904, 4912, 4920, 4928, 4936, 4944, 4952, 4960, 4968, 4976, 4984, 4992, 5000, 5008, 5016, 5024, 5032, 5040, 5048, 5056, 5064, 5072, 5080, 5088, 5096, 5104, 5112, 5120, 5128, 5136, 5144, 5152, 5160, 5168, 5176, 5184, 5192, 5200, 5208, 5216, 5224, 5232, 5240, 5248, 5256, 5264, 5272, 5280, 5288, 5296, 5304, 5312, 5320, 5328, 5336, 5344, 5352, 5360, 5368, 5376, 5384, 5392, 5400, 5408, 5416, 5424, 5432, 5440, 5448, 5456, 5464, 5472, 5480, 5488, 5496, 5504, 5512, 5520, 5528, 5536, 5544, 5552, 5560, 5568, 5576, 5584, 5592, 5600, 5608, 5616, 5624, 5632, 5640, 5648, 5656, 5664, 5672, 5680, 5688, 5696, 5704, 5712, 5720, 5728, 5736, 5744, 5752, 5760, 5768, 5776, 5784, 5792, 5800, 5808, 5816, 5824, 5832, 5840, 5848, 5856, 5864, 5872, 5880, 5888, 5896, 5904, 5912, 5920, 5928, 5936, 5944, 5952, 5960, 5968, 5976, 5984, 5992, 6000, 6008, 6016, 6024, 6032, 6040, 6048, 6056, 6064, 6072, 6080, 6088, 6096, 6104, 6112, 6120, 6128, 6136, 6144, 6152, 6160, 6168, 6176, 6184, 6192, 6200, 6208, 6216, 6224, 6232, 6240, 6248, 6256, 6264, 6272, 6280, 6288, 6296, 6304, 6312, 6320, 6328, 6336, 6344, 6352, 6360, 6368, 6376, 6384, 6392, 6400, 6408, 6416, 6424, 6432, 6440, 6448, 6456, 6464, 6472, 6480, 6488, 6496, 6504, 6512, 6520, 6528, 6536, 6544, 6552, 6560, 6568, 6576, 6584, 6592, 6600, 6608, 6616, 6624, 6632, 6640, 6648, 6656, 6664, 6672, 6680, 6688, 6696, 6704, 6712, 6720, 6728, 6736, 6744, 6752, 6760, 6768, 6776, 6784, 6792, 6800, 6808, 6816, 6824, 6832, 6840, 6848, 6856, 6864, 6872, 6880, 6888, 6896, 6904, 6912, 6920, 6928, 6936, 6944, 6952, 6960, 6968, 6976, 6984, 6992, 7000, 7008, 7016, 7024, 7032, 7040, 7048, 7056, 7064, 7072, 7080, 7088, 7096, 7104, 7112, 7120, 7128, 7136, 7144, 7152, 7160, 7168, 7176, 7184, 7192, 7200, 7208, 7216, 7224, 7232, 7240, 7248, 7256, 7264, 7272, 7280, 7288, 7296, 7304, 7312, 7320, 7328, 7336, 7344, 7352, 7360, 7368, 7376, 7384, 7392, 7400, 7408, 7416, 7424, 7432, 7440, 7448, 7456, 7464, 7472, 7480, 7488, 7496, 7504, 7512, 7520, 7528, 7536, 7544, 7552, 7560, 7568, 7576, 7584, 7592, 7600, 7608, 7616, 7624, 7632, 7640, 7648, 7656, 7664, 7672, 7680, 7688, 7696, 7704, 7712, 7720, 7728, 7736, 7744, 7752, 7760, 7768, 7776, 7784, 7792, 7800, 7808, 7816, 7824, 7832, 7840, 7848, 7856, 7864, 7872, 7880, 7888, 7896, 7904, 7912, 7920, 7928, 7936, 7944, 7952, 7960, 7968, 7976, 7984, 7992, 8000, [...], 8

So the LCM for 4 and 8 is 8

Another method to find LCM for numbers 4 and 8 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors: