Add 21/28 and 7/10
21/28 + 7/10 is 29/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 10 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
21/28 = 21 × 5/28 × 5 = 105/140 - Likewise, for the 2nd fraction, since 10 × 14 = 140,
7/10 = 7 × 14/10 × 14 = 98/140 - Add the two like fractions:
105/140 + 98/140 = 105 + 98/140 = 203/140 - 203/140 simplified gives 29/20
- So, 21/28 + 7/10 = 29/20
In mixed form: 19/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+7/10 21/28+14/10 21/56+7/10 21/28+7/20 63/28+7/10 21/28+21/10 21/84+7/10 21/28+7/30 21/28+35/10 21/28+7/50 21/28+49/10 21/28+7/70