Add 21/28 and 9/10
21/28 + 9/10 is 33/20.
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,
9/10 = 9 × 14/10 × 14 = 126/140 - Add the two like fractions:
105/140 + 126/140 = 105 + 126/140 = 231/140 - 231/140 simplified gives 33/20
- So, 21/28 + 9/10 = 33/20
In mixed form: 113/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+9/10 21/28+18/10 21/56+9/10 21/28+9/20 63/28+9/10 21/28+27/10 21/84+9/10 21/28+9/30 21/28+45/10 21/28+9/50 21/28+63/10 21/28+9/70