Add 72/20 and 42/56
1st number: 3 12/20, 2nd number: 42/56
72/20 + 42/56 is 87/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 20 × 14 = 280,
72/20 = 72 × 14/20 × 14 = 1008/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
42/56 = 42 × 5/56 × 5 = 210/280 - Add the two like fractions:
1008/280 + 210/280 = 1008 + 210/280 = 1218/280 - 1218/280 simplified gives 87/20
- So, 72/20 + 42/56 = 87/20
In mixed form: 47/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20+84/56 72/40+42/56 72/60+42/56