Add 21/28 and 27/20
1st number: 21/28, 2nd number: 1 7/20
21/28 + 27/20 is 21/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 20 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 20 × 7 = 140,
27/20 = 27 × 7/20 × 7 = 189/140 - Add the two like fractions:
105/140 + 189/140 = 105 + 189/140 = 294/140 - 294/140 simplified gives 21/10
- So, 21/28 + 27/20 = 21/10
In mixed form: 21/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+27/20 21/28+54/20 21/56+27/20 21/28+27/40 63/28+27/20 21/28+81/20 21/84+27/20 21/28+27/60