Answers

Add 45/60 and 40/21

1^st number: 45/60, 2^nd number: 1 19/21

45/60 + 40/21 is 223/84.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 60 and 21 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 60 × 7 = 420,
   45/60 = 45 × 7/60 × 7 = 315/420
3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
   40/21 = 40 × 20/21 × 20 = 800/420
4. Add the two like fractions:
   315/420 + 800/420 = 315 + 800/420 = 1115/420
5. 1115/420 simplified gives 223/84
6. So, 45/60 + 40/21 = 223/84
   In mixed form: 255/84

MathStep (Works offline)

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

Related: ⁹⁰/₆₀+⁴⁰/₂₁ ⁴⁵/₆₀+⁸⁰/₂₁ ⁴⁵/₆₀+⁴⁰/₄₂ ⁴⁵/₆₀+⁴⁰/₆₃

Add Fractions Calculator