Answers

Add 90/21 and 60/72

1^st number: 4 6/21, 2^nd number: 60/72

90/21 + 60/72 is 215/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 21 × 24 = 504,
   90/21 = 90 × 24/21 × 24 = 2160/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   60/72 = 60 × 7/72 × 7 = 420/504
4. Add the two like fractions:
   2160/504 + 420/504 = 2160 + 420/504 = 2580/504
5. 2580/504 simplified gives 215/42
6. So, 90/21 + 60/72 = 215/42
   In mixed form: 55/42

MathStep (Works offline)

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

Related: ⁹⁰/₄₂+⁶⁰/₇₂ ⁹⁰/₆₃+⁶⁰/₇₂

Add Fractions Calculator