Add 9/21 and 21/70
9/21 + 21/70 is 51/70.
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,
9/21 = 9 × 10/21 × 10 = 90/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
21/70 = 21 × 3/70 × 3 = 63/210 - Add the two like fractions:
90/210 + 63/210 = 90 + 63/210 = 153/210 - 153/210 simplified gives 51/70
- So, 9/21 + 21/70 = 51/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21+21/70 9/21+42/70 9/42+21/70 27/21+21/70 9/21+63/70 9/63+21/70 45/21+21/70 63/21+21/70