Add 6/27 and 15/21, Solve 6/27 + 15/21 as a fraction

Add 6/27 and 15/21

6/27 + 15/21 is 59/63.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 21 is 189

Next, find the equivalent fraction of both fractional numbers with denominator 189
For the 1st fraction, since 27 × 7 = 189,
6/27 = 6 × 7/27 × 7 = 42/189
Likewise, for the 2nd fraction, since 21 × 9 = 189,
15/21 = 15 × 9/21 × 9 = 135/189
Add the two like fractions:
42/189 + 135/189 = 42 + 135/189 = 177/189
177/189 simplified gives 59/63
So, 6/27 + 15/21 = 59/63

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