Answers

Add 28/20 and 54/72

1^st number: 1 8/20, 2^nd number: 54/72

28/20 + 54/72 is 43/20.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 72 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 20 × 18 = 360,
   28/20 = 28 × 18/20 × 18 = 504/360
3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
   54/72 = 54 × 5/72 × 5 = 270/360
4. Add the two like fractions:
   504/360 + 270/360 = 504 + 270/360 = 774/360
5. 774/360 simplified gives 43/20
6. So, 28/20 + 54/72 = 43/20
   In mixed form: 23/20

MathStep (Works offline)

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

Related: ⁵⁶/₂₀+⁵⁴/₇₂ ²⁸/₄₀+⁵⁴/₇₂ ⁸⁴/₂₀+⁵⁴/₇₂ ²⁸/₆₀+⁵⁴/₇₂

Add Fractions Calculator