Add 60/42 and 15/21, Solve 1 18/42 + 15/21 as a fraction

Add 60/42 and 15/21

1^st number: 1 18/42, 2^nd number: 15/21

60/42 + 15/21 is 15/7.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 42 × 1 = 42,
60/42 = 60 × 1/42 × 1 = 60/42
Likewise, for the 2nd fraction, since 21 × 2 = 42,
15/21 = 15 × 2/21 × 2 = 30/42
Add the two like fractions:
60/42 + 30/42 = 60 + 30/42 = 90/42
90/42 simplified gives 15/7
So, 60/42 + 15/21 = 15/7
In mixed form: 21/7

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