Answers

Add 8/4 and 7/21

1^st number: 2 0/4, 2^nd number: 7/21

8/4 + 7/21 is 7/3.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 21 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 4 × 21 = 84,
   8/4 = 8 × 21/4 × 21 = 168/84
3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
   7/21 = 7 × 4/21 × 4 = 28/84
4. Add the two like fractions:
   168/84 + 28/84 = 168 + 28/84 = 196/84
5. 196/84 simplified gives 7/3
6. So, 8/4 + 7/21 = 7/3
   In mixed form: 21/3

MathStep (Works offline)

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

Related: ¹⁶/₄+⁷/₂₁ ⁸/₄+¹⁴/₂₁ ⁸/₄+⁷/₄₂ ²⁴/₄+⁷/₂₁ ⁸/₁₂+⁷/₂₁ ⁸/₄+⁷/₆₃ ⁴⁰/₄+⁷/₂₁ ⁸/₄+³⁵/₂₁ ⁸/₂₀+⁷/₂₁ ⁵⁶/₄+⁷/₂₁ ⁸/₄+⁴⁹/₂₁ ⁸/₂₈+⁷/₂₁

Add Fractions Calculator