Add 21/35 and 21/70
21/35 + 21/70 is 9/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 35 × 2 = 70,
21/35 = 21 × 2/35 × 2 = 42/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
21/70 = 21 × 1/70 × 1 = 21/70 - Add the two like fractions:
42/70 + 21/70 = 42 + 21/70 = 63/70 - 63/70 simplified gives 9/10
- So, 21/35 + 21/70 = 9/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35+21/70 21/35+42/70 21/70+21/70 63/35+21/70 21/35+63/70