Answers

Add 45/63 and 5/21

45/63 + 5/21 is 20/21.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 21 is 63
   
   Next, find the equivalent fraction of both fractional numbers with denominator 63
2. For the 1st fraction, since 63 × 1 = 63,
   45/63 = 45 × 1/63 × 1 = 45/63
3. Likewise, for the 2nd fraction, since 21 × 3 = 63,
   5/21 = 5 × 3/21 × 3 = 15/63
4. Add the two like fractions:
   45/63 + 15/63 = 45 + 15/63 = 60/63
5. 60/63 simplified gives 20/21
6. So, 45/63 + 5/21 = 20/21

MathStep (Works offline)

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

Related: ⁹⁰/₆₃+⁵/₂₁ ⁴⁵/₆₃+¹⁰/₂₁ ⁴⁵/₆₃+⁵/₄₂ ⁴⁵/₆₃+¹⁵/₂₁ ⁴⁵/₆₃+⁵/₆₃ ⁴⁵/₆₃+²⁵/₂₁ ⁴⁵/₆₃+³⁵/₂₁

Add Fractions Calculator