LCM for 10 and 840

The first method to find LCM for numbers 10 and 840 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 10 and 840 is 10, so

LCM = (10 × 840) ÷ 10

LCM = 8400 ÷ 10

LCM = 840

The second method to find LCM for numbers 10 and 840 is to list out the common multiples for both nubmers and pick the first which matching:

Multiples of 10: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 650, 660, 670, 680, 690, 700, 710, 720, 730, 740, 750, 760, 770, 780, 790, 800, 810, 820, 830, 840, 850, 860

Multiples of 840: 840, 1680, 2520, 3360, 4200, 5040, 5880, 6720, 7560, 8400, 9240, 10080, 10920, 11760, 12600, 13440, 14280, 15120, 15960, 16800, 17640, 18480, 19320, 20160, 21000, 21840, 22680, 23520, 24360, 25200, 26040, 26880, 27720, 28560, 29400, 30240, 31080, 31920, 32760, 33600, 34440, 35280, 36120, 36960, 37800, 38640, 39480, 40320, 41160, 42000, 42840, 43680, 44520, 45360, 46200, 47040, 47880, 48720, 49560, 50400, 51240, 52080, 52920, 53760, 54600, 55440, 56280, 57120, 57960, 58800, 59640, 60480, 61320, 62160, 63000, 63840, 64680, 65520, 66360, 67200, 68040, 68880, 69720, 70560, 71400, 72240, [...], 840

So the LCM for 10 and 840 is 840

Another method to find LCM for numbers 10 and 840 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors: