Answers

Add 70/40 and 20/42

1^st number: 1 30/40, 2^nd number: 20/42

70/40 + 20/42 is 187/84.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 42 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 40 × 21 = 840,
   70/40 = 70 × 21/40 × 21 = 1470/840
3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
   20/42 = 20 × 20/42 × 20 = 400/840
4. Add the two like fractions:
   1470/840 + 400/840 = 1470 + 400/840 = 1870/840
5. 1870/840 simplified gives 187/84
6. So, 70/40 + 20/42 = 187/84
   In mixed form: 219/84

MathStep (Works offline)

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

Related: ⁷⁰/₄₀+⁴⁰/₄₂ ⁷⁰/₈₀+²⁰/₄₂ ⁷⁰/₄₀+²⁰/₈₄ ⁷⁰/₄₀+⁶⁰/₄₂

Add Fractions Calculator