Add 21/63 and 9/28
21/63 + 9/28 is 55/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 28 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 63 × 4 = 252,
21/63 = 21 × 4/63 × 4 = 84/252 - Likewise, for the 2nd fraction, since 28 × 9 = 252,
9/28 = 9 × 9/28 × 9 = 81/252 - Add the two like fractions:
84/252 + 81/252 = 84 + 81/252 = 165/252 - 165/252 simplified gives 55/84
- So, 21/63 + 9/28 = 55/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63+9/28 21/63+18/28 21/63+9/56 21/63+27/28 21/63+9/84 21/63+45/28 21/63+63/28