Answers

Subtract 15/7 from 21/70

1^st number: 21/70, 2^nd number: 2 1/7

21/70 - 15/7 is -129/70.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 7 is 70
   
   Next, find the equivalent fraction of both fractional numbers with denominator 70
2. For the 1st fraction, since 70 × 1 = 70,
   21/70 = 21 × 1/70 × 1 = 21/70
3. Likewise, for the 2nd fraction, since 7 × 10 = 70,
   15/7 = 15 × 10/7 × 10 = 150/70
4. Subtract the two like fractions:
   21/70 - 150/70 = 21 - 150/70 = -129/70

MathStep (Works offline)

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

Related: ⁴²/₇₀-¹⁵/₇ ²¹/₇₀-³⁰/₇ ²¹/₇₀-¹⁵/₁₄ ⁶³/₇₀-¹⁵/₇ ²¹/₇₀-⁴⁵/₇ ²¹/₇₀-¹⁵/₂₁ ²¹/₇₀-⁷⁵/₇ ²¹/₇₀-¹⁵/₃₅ ²¹/₇₀-¹⁵/₄₉

Subtract Fractions Calculator