It is 120
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Multiples of 6: 6, 12, 18, 24, 30, 36, ................ Multiples of 10: 10, 20, 30, 40, ................ 30 is the LCM (least common multiple) of 6 and 10. correct but LCM stands for lowest common multiple...
The multiples of 4 up to 30 are: 4, 8, 12, 16, 20, 24, 28.
The multiples of 8 are 8, 16, 24, 32, 40, 48 and so on.The multiples of 10 are 10, 20, 30, 40, 50 and so on.40 is the first number to appear on both lists.
The LCM of 5, 10, and 15 is 30. The multiples of 5 are 5, 10, 15, 20, 25, 30, and so on. The multiples of 10 are 10, 20, 30, and so on. The multiples of 15 are 15, 30, and so on. So the LCM of 5, 10, and 15 is 30.
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.