Asked by Ren

if you know the lcm of 4 and 5, how could you find the lcm of 40 and 50

11 years ago

Answered by Damon

4=2*2
5 = 5
LCM = 2*2*5 = 20

40 = 10*4
50 = 10*5
so I suspect that LCM = 10*20 = 200

check
40 = 10 * 4 = 2 * 5 * 2 * 2
50 = 10 * 5 = 2 * 5 * 5
need 3 twos and two fives
2*2*2 * 5*5 = 8*25 = 200 sure enough

11 years ago

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