Add 5/7 and 21/70
5/7 + 21/70 is 71/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 7 × 10 = 70,
5/7 = 5 × 10/7 × 10 = 50/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
21/70 = 21 × 1/70 × 1 = 21/70 - Add the two like fractions:
50/70 + 21/70 = 50 + 21/70 = 71/70 - So, 5/7 + 21/70 = 71/70
In mixed form: 11/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/7+21/70 5/7+42/70 5/14+21/70 15/7+21/70 5/7+63/70 5/21+21/70 25/7+21/70 5/35+21/70 35/7+21/70 5/49+21/70