Answers

Add 20/21 and 3/60

20/21 + 3/60 is 421/420.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 60 is 420
2. For the 1st fraction, since 21 × 20 = 420,
   20/21 = 20 × 20/21 × 20 = 400/420
3. Likewise, for the 2nd fraction, since 60 × 7 = 420,
   3/60 = 3 × 7/60 × 7 = 21/420
4. Add the two fractions:
   400/420 + 21/420 = 400 + 21/420 = 421/420
5. In mixed form: 11/420

MathStep (Works offline)

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

Related: ⁴⁰/₂₁+³/₆₀ ²⁰/₂₁+⁶/₆₀ ²⁰/₄₂+³/₆₀ ⁶⁰/₂₁+³/₆₀ ²⁰/₂₁+⁹/₆₀ ²⁰/₆₃+³/₆₀ ²⁰/₂₁+¹⁵/₆₀ ²⁰/₂₁+²¹/₆₀

Add Fractions Calculator