Answers

Add 45/20 and 21/63

1^st number: 2 5/20, 2^nd number: 21/63

45/20 + 21/63 is 31/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 63 is 1260
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1260
2. For the 1st fraction, since 20 × 63 = 1260,
   45/20 = 45 × 63/20 × 63 = 2835/1260
3. Likewise, for the 2nd fraction, since 63 × 20 = 1260,
   21/63 = 21 × 20/63 × 20 = 420/1260
4. Add the two like fractions:
   2835/1260 + 420/1260 = 2835 + 420/1260 = 3255/1260
5. 3255/1260 simplified gives 31/12
6. So, 45/20 + 21/63 = 31/12
   In mixed form: 27/12

MathStep (Works offline)

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

Related: ⁹⁰/₂₀+²¹/₆₃ ⁴⁵/₂₀+⁴²/₆₃ ⁴⁵/₄₀+²¹/₆₃ ⁴⁵/₆₀+²¹/₆₃

Add Fractions Calculator