Add 15/42 and 21/27
15/42 + 21/27 is 143/126.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 27 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
15/42 = 15 × 9/42 × 9 = 135/378 - Likewise, for the 2nd fraction, since 27 × 14 = 378,
21/27 = 21 × 14/27 × 14 = 294/378 - Add the two like fractions:
135/378 + 294/378 = 135 + 294/378 = 429/378 - 429/378 simplified gives 143/126
- So, 15/42 + 21/27 = 143/126
In mixed form: 117/126
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