Add 5/21 and 21/70
5/21 + 21/70 is 113/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
5/21 = 5 × 10/21 × 10 = 50/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Add the two like fractions:
50/210 + 63/210 = 50 + 63/210 = 113/210 - So, 5/21 + 21/70 = 113/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+21/70 5/21+42/70 5/42+21/70 15/21+21/70 5/21+63/70 5/63+21/70 25/21+21/70 35/21+21/70