Answers

Add 8/40 and 63/21

1^st number: 8/40, 2^nd number: 3 0/21

8/40 + 63/21 is 16/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 21 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 40 × 21 = 840,
   8/40 = 8 × 21/40 × 21 = 168/840
3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
   63/21 = 63 × 40/21 × 40 = 2520/840
4. Add the two like fractions:
   168/840 + 2520/840 = 168 + 2520/840 = 2688/840
5. 2688/840 simplified gives 16/5
6. So, 8/40 + 63/21 = 16/5
   In mixed form: 31/5

MathStep (Works offline)

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

Related: ¹⁶/₄₀+⁶³/₂₁ ⁸/₈₀+⁶³/₂₁ ⁸/₄₀+⁶³/₄₂ ²⁴/₄₀+⁶³/₂₁ ⁵⁶/₄₀+⁶³/₂₁

Add Fractions Calculator