how to find the least common multiple using fractions

let us add two fractions

1/5 +2/7

7+10/35=17/35

so denominator 35 is LCM of 5 and 7

again,

2/5+1/10

making the denominator common

4/10+1/10

5/10

so 10 is the LCM of 5 and 10.

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