Add 63/70 and 21/15
1st number: 63/70, 2nd number: 1 6/15
63/70 + 21/15 is 23/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
63/70 = 63 × 3/70 × 3 = 189/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
21/15 = 21 × 14/15 × 14 = 294/210 - Add the two like fractions:
189/210 + 294/210 = 189 + 294/210 = 483/210 - 483/210 simplified gives 23/10
- So, 63/70 + 21/15 = 23/10
In mixed form: 23/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/70+42/15 63/70+21/30 63/70+63/15 63/70+21/45 63/70+21/75