Add 21/28 and 4/21
21/28 + 4/21 is 79/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
21/28 = 21 × 3/28 × 3 = 63/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
4/21 = 4 × 4/21 × 4 = 16/84 - Add the two like fractions:
63/84 + 16/84 = 63 + 16/84 = 79/84 - So, 21/28 + 4/21 = 79/84
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