Add 15/8 and 21/72
1st number: 1 7/8, 2nd number: 21/72
15/8 + 21/72 is 13/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
15/8 = 15 × 9/8 × 9 = 135/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
21/72 = 21 × 1/72 × 1 = 21/72 - Add the two like fractions:
135/72 + 21/72 = 135 + 21/72 = 156/72 - 156/72 simplified gives 13/6
- So, 15/8 + 21/72 = 13/6
In mixed form: 21/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/8+21/72 15/8+42/72 15/16+21/72 45/8+21/72 15/8+63/72 15/24+21/72 75/8+21/72 15/40+21/72 15/56+21/72