Answers

Add 72/63 and 45/20

1^st number: 1 9/63, 2^nd number: 2 5/20

72/63 + 45/20 is 95/28.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 20 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 63 × 20 = 1260,
   72/63 = 72 × 20/63 × 20 = 1440/1260
3. Likewise, for the 2nd fraction, since 20 × 63 = 1260,
   45/20 = 45 × 63/20 × 63 = 2835/1260
4. Add the two like fractions:
   1440/1260 + 2835/1260 = 1440 + 2835/1260 = 4275/1260
5. 4275/1260 simplified gives 95/28
6. So, 72/63 + 45/20 = 95/28
   In mixed form: 311/28

MathStep (Works offline)

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

Related: ⁷²/₆₃+⁹⁰/₂₀ ⁷²/₆₃+⁴⁵/₄₀ ⁷²/₆₃+⁴⁵/₆₀

Add Fractions Calculator