Add 1/21 and 15/70
1/21 + 15/70 is 11/42.
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,
1/21 = 1 × 10/21 × 10 = 10/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
15/70 = 15 × 3/70 × 3 = 45/210 - Add the two like fractions:
10/210 + 45/210 = 10 + 45/210 = 55/210 - 55/210 simplified gives 11/42
- So, 1/21 + 15/70 = 11/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+15/70 1/21+30/70 1/42+15/70 3/21+15/70 1/21+45/70 1/63+15/70 5/21+15/70 1/21+75/70 7/21+15/70