Answers

Add 20/40 and 42/35

1^st number: 20/40, 2^nd number: 1 7/35

20/40 + 42/35 is 17/10.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 35 is 280
   
   Next, find the equivalent fraction of both fractional numbers with denominator 280
2. For the 1st fraction, since 40 × 7 = 280,
   20/40 = 20 × 7/40 × 7 = 140/280
3. Likewise, for the 2nd fraction, since 35 × 8 = 280,
   42/35 = 42 × 8/35 × 8 = 336/280
4. Add the two like fractions:
   140/280 + 336/280 = 140 + 336/280 = 476/280
5. 476/280 simplified gives 17/10
6. So, 20/40 + 42/35 = 17/10
   In mixed form: 17/10

MathStep (Works offline)

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

Related: ²⁰/₄₀+⁸⁴/₃₅ ²⁰/₈₀+⁴²/₃₅ ²⁰/₄₀+⁴²/₇₀ ⁶⁰/₄₀+⁴²/₃₅

Add Fractions Calculator