Add 21/28 and 8/7
1st number: 21/28, 2nd number: 1 1/7
21/28 + 8/7 is 53/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 7 is 28
Next, find the equivalent fraction of both fractional numbers with denominator 28 - For the 1st fraction, since 28 × 1 = 28,
21/28 = 21 × 1/28 × 1 = 21/28 - Likewise, for the 2nd fraction, since 7 × 4 = 28,
8/7 = 8 × 4/7 × 4 = 32/28 - Add the two like fractions:
21/28 + 32/28 = 21 + 32/28 = 53/28 - So, 21/28 + 8/7 = 53/28
In mixed form: 125/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+8/7 21/28+16/7 21/56+8/7 21/28+8/14 63/28+8/7 21/28+24/7 21/84+8/7 21/28+8/21 21/28+40/7 21/28+8/35 21/28+56/7 21/28+8/49