Answers

Add 15/40 and 75/70

1^st number: 15/40, 2^nd number: 1 5/70

15/40 + 75/70 is 81/56.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 70 is 280
   
   Next, find the equivalent fraction of both fractional numbers with denominator 280
2. For the 1st fraction, since 40 × 7 = 280,
   15/40 = 15 × 7/40 × 7 = 105/280
3. Likewise, for the 2nd fraction, since 70 × 4 = 280,
   75/70 = 75 × 4/70 × 4 = 300/280
4. Add the two like fractions:
   105/280 + 300/280 = 105 + 300/280 = 405/280
5. 405/280 simplified gives 81/56
6. So, 15/40 + 75/70 = 81/56
   In mixed form: 125/56

MathStep (Works offline)

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

Related: ³⁰/₄₀+⁷⁵/₇₀ ¹⁵/₈₀+⁷⁵/₇₀ ⁴⁵/₄₀+⁷⁵/₇₀ ⁷⁵/₄₀+⁷⁵/₇₀

Add Fractions Calculator