40 ... because 5 x 8 = 40 = 2 x 20 = 40
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The LCM of 8, 10, and 20 is 40. Multiples of 8: 8, 16, 24, 32, 40, 48...... Multiples of 10: 10, 20, 30, 40, 50, 60...... Multiples of 20: 20, 40, 60, 80 The smallest number that all three numbers go into evenly is 40. Therefore the LCM of 8, 10, and 20 is 40.
24
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The common multiples of 9 and 16 are 144, 288, 432 and so on.
The Least Common Multiple (LCM) for 8 10 15 is 120.