Add 72/20 and 7/8
1st number: 3 12/20, 2nd number: 7/8
72/20 + 7/8 is 179/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
72/20 = 72 × 2/20 × 2 = 144/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
7/8 = 7 × 5/8 × 5 = 35/40 - Add the two like fractions:
144/40 + 35/40 = 144 + 35/40 = 179/40 - So, 72/20 + 7/8 = 179/40
In mixed form: 419/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20+14/8 72/40+7/8 72/20+7/16 72/20+21/8 72/60+7/8 72/20+7/24 72/20+35/8 72/20+7/40 72/20+49/8 72/20+7/56