Add 28/21 and 56/70
1st number: 1 7/21, 2nd number: 56/70
28/21 + 56/70 is 32/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
28/21 = 28 × 10/21 × 10 = 280/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
56/70 = 56 × 3/70 × 3 = 168/210 - Add the two like fractions:
280/210 + 168/210 = 280 + 168/210 = 448/210 - 448/210 simplified gives 32/15
- So, 28/21 + 56/70 = 32/15
In mixed form: 22/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+56/70 28/42+56/70 84/21+56/70 28/63+56/70