Answers

Add 72/63 and 20/40

1^st number: 1 9/63, 2^nd number: 20/40

72/63 + 20/40 is 23/14.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 40 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 63 × 40 = 2520,
   72/63 = 72 × 40/63 × 40 = 2880/2520
3. Likewise, for the 2nd fraction, since 40 × 63 = 2520,
   20/40 = 20 × 63/40 × 63 = 1260/2520
4. Add the two like fractions:
   2880/2520 + 1260/2520 = 2880 + 1260/2520 = 4140/2520
5. 4140/2520 simplified gives 23/14
6. So, 72/63 + 20/40 = 23/14
   In mixed form: 19/14

MathStep (Works offline)

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

Related: ⁷²/₆₃+²⁰/₈₀ ⁷²/₆₃+⁶⁰/₄₀

Add Fractions Calculator