Add 15/21 and 7/70
15/21 + 7/70 is 57/70.
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,
15/21 = 15 × 10/21 × 10 = 150/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
7/70 = 7 × 3/70 × 3 = 21/210 - Add the two like fractions:
150/210 + 21/210 = 150 + 21/210 = 171/210 - 171/210 simplified gives 57/70
- So, 15/21 + 7/70 = 57/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+7/70 15/21+14/70 15/42+7/70 45/21+7/70 15/21+21/70 15/63+7/70 75/21+7/70 15/21+35/70 15/21+49/70