In LCM choose the least common multiple
LCM(8, 10) = 40.
One way is to list the multiples of each number, then choose the common multiples, then the least one.
Multiples of 8: {8, 16, 24, 32, 40, 48, 56, 64, 72, 80,...}
Multiples of 10: {10, 20, 30, 40, 50, 60, 70, 80, 90,...}
common multiples: {40, 80,..}
LCM (8, 10) = 40
Therefore: LCM(8, 10) = 40.
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