Add 10/8 and 21/15
1st number: 1 2/8, 2nd number: 1 6/15
10/8 + 21/15 is 53/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
10/8 = 10 × 15/8 × 15 = 150/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
21/15 = 21 × 8/15 × 8 = 168/120 - Add the two like fractions:
150/120 + 168/120 = 150 + 168/120 = 318/120 - 318/120 simplified gives 53/20
- So, 10/8 + 21/15 = 53/20
In mixed form: 213/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/8+21/15 10/8+42/15 10/16+21/15 10/8+21/30 30/8+21/15 10/8+63/15 10/24+21/15 10/8+21/45 50/8+21/15 10/40+21/15 10/8+21/75 70/8+21/15 10/56+21/15