Answers

Add 21/20 and 63/64

1^st number: 1 1/20, 2^nd number: 63/64

21/20 + 63/64 is 651/320.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 64 is 320
   
   Next, find the equivalent fraction of both fractional numbers with denominator 320
2. For the 1st fraction, since 20 × 16 = 320,
   21/20 = 21 × 16/20 × 16 = 336/320
3. Likewise, for the 2nd fraction, since 64 × 5 = 320,
   63/64 = 63 × 5/64 × 5 = 315/320
4. Add the two like fractions:
   336/320 + 315/320 = 336 + 315/320 = 651/320
5. So, 21/20 + 63/64 = 651/320
   In mixed form: 211/320

MathStep (Works offline)

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

Related: ⁴²/₂₀+⁶³/₆₄ ²¹/₄₀+⁶³/₆₄ ⁶³/₂₀+⁶³/₆₄ ²¹/₆₀+⁶³/₆₄

Add Fractions Calculator