Answers

Add 84/21 and 9/72

1^st number: 4 0/21, 2^nd number: 9/72

84/21 + 9/72 is 33/8.

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,
   84/21 = 84 × 24/21 × 24 = 2016/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   9/72 = 9 × 7/72 × 7 = 63/504
4. Add the two like fractions:
   2016/504 + 63/504 = 2016 + 63/504 = 2079/504
5. 2079/504 simplified gives 33/8
6. So, 84/21 + 9/72 = 33/8
   In mixed form: 41/8

MathStep (Works offline)

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

Related: ⁸⁴/₂₁+¹⁸/₇₂ ⁸⁴/₄₂+⁹/₇₂ ⁸⁴/₂₁+²⁷/₇₂ ⁸⁴/₆₃+⁹/₇₂ ⁸⁴/₂₁+⁴⁵/₇₂ ⁸⁴/₂₁+⁶³/₇₂

Add Fractions Calculator