Add 72/40 and 21/7
1st number: 1 32/40, 2nd number: 3 0/7
72/40 + 21/7 is 24/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 7 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
72/40 = 72 × 7/40 × 7 = 504/280 - Likewise, for the 2nd fraction, since 7 × 40 = 280,
21/7 = 21 × 40/7 × 40 = 840/280 - Add the two like fractions:
504/280 + 840/280 = 504 + 840/280 = 1344/280 - 1344/280 simplified gives 24/5
- So, 72/40 + 21/7 = 24/5
In mixed form: 44/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/40+42/7 72/80+21/7 72/40+21/14 72/40+63/7 72/40+21/35 72/40+21/49