Add 40/56 and 21/30
40/56 + 21/30 is 99/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 30 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 56 × 15 = 840,
40/56 = 40 × 15/56 × 15 = 600/840 - Likewise, for the 2nd fraction, since 30 × 28 = 840,
21/30 = 21 × 28/30 × 28 = 588/840 - Add the two like fractions:
600/840 + 588/840 = 600 + 588/840 = 1188/840 - 1188/840 simplified gives 99/70
- So, 40/56 + 21/30 = 99/70
In mixed form: 129/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/56+21/30 40/56+42/30 40/56+21/60 40/56+63/30 40/56+21/90