Answers

Add 20/42 and 72/20

1^st number: 20/42, 2^nd number: 3 12/20

20/42 + 72/20 is 428/105.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 42 × 10 = 420,
   20/42 = 20 × 10/42 × 10 = 200/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   72/20 = 72 × 21/20 × 21 = 1512/420
4. Add the two like fractions:
   200/420 + 1512/420 = 200 + 1512/420 = 1712/420
5. 1712/420 simplified gives 428/105
6. So, 20/42 + 72/20 = 428/105
   In mixed form: 48/105

MathStep (Works offline)

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

Related: ⁴⁰/₄₂+⁷²/₂₀ ²⁰/₈₄+⁷²/₂₀ ²⁰/₄₂+⁷²/₄₀ ⁶⁰/₄₂+⁷²/₂₀ ²⁰/₄₂+⁷²/₆₀

Add Fractions Calculator