Answers

Add 4/42 and 8/21

4/42 + 8/21 is 10/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 21 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 42 × 1 = 42,
   4/42 = 4 × 1/42 × 1 = 4/42
3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
   8/21 = 8 × 2/21 × 2 = 16/42
4. Add the two like fractions:
   4/42 + 16/42 = 4 + 16/42 = 20/42
5. 20/42 simplified gives 10/21
6. So, 4/42 + 8/21 = 10/21

MathStep (Works offline)

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

Related: ⁸/₄₂+⁸/₂₁ ⁴/₄₂+¹⁶/₂₁ ⁴/₈₄+⁸/₂₁ ⁴/₄₂+⁸/₄₂ ¹²/₄₂+⁸/₂₁ ⁴/₄₂+²⁴/₂₁ ⁴/₄₂+⁸/₆₃ ²⁰/₄₂+⁸/₂₁ ⁴/₄₂+⁴⁰/₂₁ ²⁸/₄₂+⁸/₂₁ ⁴/₄₂+⁵⁶/₂₁

Add Fractions Calculator