Add 20/84 and 21/70
20/84 + 21/70 is 113/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 70 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
20/84 = 20 × 5/84 × 5 = 100/420 - Likewise, for the 2nd fraction, since 70 × 6 = 420,
21/70 = 21 × 6/70 × 6 = 126/420 - Add the two like fractions:
100/420 + 126/420 = 100 + 126/420 = 226/420 - 226/420 simplified gives 113/210
- So, 20/84 + 21/70 = 113/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/84+21/70 20/84+42/70 60/84+21/70 20/84+63/70