Add 21/28 and 25/63
21/28 + 25/63 is 289/252.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 63 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
21/28 = 21 × 9/28 × 9 = 189/252 - Likewise, for the 2nd fraction, since 63 × 4 = 252,
25/63 = 25 × 4/63 × 4 = 100/252 - Add the two like fractions:
189/252 + 100/252 = 189 + 100/252 = 289/252 - So, 21/28 + 25/63 = 289/252
In mixed form: 137/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+25/63 21/28+50/63 21/56+25/63 63/28+25/63 21/28+75/63 21/84+25/63