Answers

Add 70/72 and 45/20

1^st number: 70/72, 2^nd number: 2 5/20

70/72 + 45/20 is 29/9.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 20 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 72 × 5 = 360,
   70/72 = 70 × 5/72 × 5 = 350/360
3. Likewise, for the 2nd fraction, since 20 × 18 = 360,
   45/20 = 45 × 18/20 × 18 = 810/360
4. Add the two like fractions:
   350/360 + 810/360 = 350 + 810/360 = 1160/360
5. 1160/360 simplified gives 29/9
6. So, 70/72 + 45/20 = 29/9
   In mixed form: 32/9

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁷⁰/₇₂+⁹⁰/₂₀ ⁷⁰/₇₂+⁴⁵/₄₀ ⁷⁰/₇₂+⁴⁵/₆₀

Add Fractions Calculator