Answers

Add 21/70 and 15/56

21/70 + 15/56 is 159/280.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 56 is 280
   
   Next, find the equivalent fraction of both fractional numbers with denominator 280
2. For the 1st fraction, since 70 × 4 = 280,
   21/70 = 21 × 4/70 × 4 = 84/280
3. Likewise, for the 2nd fraction, since 56 × 5 = 280,
   15/56 = 15 × 5/56 × 5 = 75/280
4. Add the two like fractions:
   84/280 + 75/280 = 84 + 75/280 = 159/280
5. So, 21/70 + 15/56 = 159/280

MathStep (Works offline)

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

Related: ⁴²/₇₀+¹⁵/₅₆ ²¹/₇₀+³⁰/₅₆ ⁶³/₇₀+¹⁵/₅₆ ²¹/₇₀+⁴⁵/₅₆ ²¹/₇₀+⁷⁵/₅₆

Add Fractions Calculator