Add 56/72 and 21/70
56/72 + 21/70 is 97/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 70 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 72 × 35 = 2520,
56/72 = 56 × 35/72 × 35 = 1960/2520 - Likewise, for the 2nd fraction, since 70 × 36 = 2520,
21/70 = 21 × 36/70 × 36 = 756/2520 - Add the two like fractions:
1960/2520 + 756/2520 = 1960 + 756/2520 = 2716/2520 - 2716/2520 simplified gives 97/90
- So, 56/72 + 21/70 = 97/90
In mixed form: 17/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/72+42/70 56/72+63/70