Add 28/63 and 21/49
28/63 + 21/49 is 55/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 49 is 441
Next, find the equivalent fraction of both fractional numbers with denominator 441 - For the 1st fraction, since 63 × 7 = 441,
28/63 = 28 × 7/63 × 7 = 196/441 - Likewise, for the 2nd fraction, since 49 × 9 = 441,
21/49 = 21 × 9/49 × 9 = 189/441 - Add the two like fractions:
196/441 + 189/441 = 196 + 189/441 = 385/441 - 385/441 simplified gives 55/63
- So, 28/63 + 21/49 = 55/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/63+21/49 28/63+42/49 28/63+21/98 84/63+21/49 28/63+63/49