Add 27/70 and 15/21
27/70 + 15/21 is 11/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
27/70 = 27 × 3/70 × 3 = 81/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
15/21 = 15 × 10/21 × 10 = 150/210 - Add the two like fractions:
81/210 + 150/210 = 81 + 150/210 = 231/210 - 231/210 simplified gives 11/10
- So, 27/70 + 15/21 = 11/10
In mixed form: 11/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/70+15/21 27/70+30/21 27/70+15/42 81/70+15/21 27/70+45/21 27/70+15/63 27/70+75/21