Add 10/21 and 15/70
10/21 + 15/70 is 29/42.
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,
10/21 = 10 × 10/21 × 10 = 100/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
15/70 = 15 × 3/70 × 3 = 45/210 - Add the two like fractions:
100/210 + 45/210 = 100 + 45/210 = 145/210 - 145/210 simplified gives 29/42
- So, 10/21 + 15/70 = 29/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+15/70 10/21+30/70 10/42+15/70 30/21+15/70 10/21+45/70 10/63+15/70 50/21+15/70 10/21+75/70 70/21+15/70