Add 42/15 and 21/70
1st number: 2 12/15, 2nd number: 21/70
42/15 + 21/70 is 31/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 15 × 14 = 210,
42/15 = 42 × 14/15 × 14 = 588/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Add the two like fractions:
588/210 + 63/210 = 588 + 63/210 = 651/210 - 651/210 simplified gives 31/10
- So, 42/15 + 21/70 = 31/10
In mixed form: 31/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15+21/70 42/15+42/70 42/30+21/70 42/15+63/70 42/45+21/70 42/75+21/70