Add 40/21 and 56/72
1st number: 1 19/21, 2nd number: 56/72
40/21 + 56/72 is 169/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
40/21 = 40 × 24/21 × 24 = 960/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
56/72 = 56 × 7/72 × 7 = 392/504 - Add the two like fractions:
960/504 + 392/504 = 960 + 392/504 = 1352/504 - 1352/504 simplified gives 169/63
- So, 40/21 + 56/72 = 169/63
In mixed form: 243/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+56/72 40/42+56/72 40/63+56/72