Add 15/21 and 42/63
15/21 + 42/63 is 29/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
15/21 = 15 × 3/21 × 3 = 45/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
42/63 = 42 × 1/63 × 1 = 42/63 - Add the two like fractions:
45/63 + 42/63 = 45 + 42/63 = 87/63 - 87/63 simplified gives 29/21
- So, 15/21 + 42/63 = 29/21
In mixed form: 18/21
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