lcm
posted by tayloir .
find the least common mutlipe of 420 196
Break down each number into prime number factors
196 = 2*2*7*7
420 = 70*2*3 = 2*2*3*5*7
The least common multiple is the product of all prime factors that occur in both numbers
2*2*3*5*7*7 = 2940

20,40,80
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