Add 21/28 and 4/15
21/28 + 4/15 is 61/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
21/28 = 21 × 15/28 × 15 = 315/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
4/15 = 4 × 28/15 × 28 = 112/420 - Add the two like fractions:
315/420 + 112/420 = 315 + 112/420 = 427/420 - 427/420 simplified gives 61/60
- So, 21/28 + 4/15 = 61/60
In mixed form: 11/60
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