Answers

Add 4/21 and 90/36

1^st number: 4/21, 2^nd number: 2 18/36

4/21 + 90/36 is 113/42.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 36 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 21 × 12 = 252,
   4/21 = 4 × 12/21 × 12 = 48/252
3. Likewise, for the 2nd fraction, since 36 × 7 = 252,
   90/36 = 90 × 7/36 × 7 = 630/252
4. Add the two like fractions:
   48/252 + 630/252 = 48 + 630/252 = 678/252
5. 678/252 simplified gives 113/42
6. So, 4/21 + 90/36 = 113/42
   In mixed form: 229/42

MathStep (Works offline)

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

Related: ⁸/₂₁+⁹⁰/₃₆ ⁴/₄₂+⁹⁰/₃₆ ⁴/₂₁+⁹⁰/₇₂ ¹²/₂₁+⁹⁰/₃₆ ⁴/₆₃+⁹⁰/₃₆ ²⁰/₂₁+⁹⁰/₃₆ ²⁸/₂₁+⁹⁰/₃₆

Add Fractions Calculator