Add 2/5 and 21/70
2/5 + 21/70 is 7/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 70 is 70
Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 5 × 14 = 70,
2/5 = 2 × 14/5 × 14 = 28/70 - Likewise, for the 2nd fraction, since 70 × 1 = 70,
21/70 = 21 × 1/70 × 1 = 21/70 - Add the two like fractions:
28/70 + 21/70 = 28 + 21/70 = 49/70 - 49/70 simplified gives 7/10
- So, 2/5 + 21/70 = 7/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/5+21/70 2/5+42/70 2/10+21/70 6/5+21/70 2/5+63/70 2/15+21/70 10/5+21/70 2/25+21/70 14/5+21/70 2/35+21/70