Add 72/45 and 7/20
1st number: 1 27/45, 2nd number: 7/20
72/45 + 7/20 is 39/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
72/45 = 72 × 4/45 × 4 = 288/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
7/20 = 7 × 9/20 × 9 = 63/180 - Add the two like fractions:
288/180 + 63/180 = 288 + 63/180 = 351/180 - 351/180 simplified gives 39/20
- So, 72/45 + 7/20 = 39/20
In mixed form: 119/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/45+14/20 72/90+7/20 72/45+7/40 72/45+21/20 72/45+7/60 72/45+35/20 72/45+49/20