Answers

Subtract 18/70 from 20/84

20/84 - 18/70 is -2/105.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 70 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   20/84 = 20 × 5/84 × 5 = 100/420
3. Likewise, for the 2nd fraction, since 70 × 6 = 420,
   18/70 = 18 × 6/70 × 6 = 108/420
4. Subtract the two like fractions:
   100/420 - 108/420 = 100 - 108/420 = -8/420
5. After reducing the fraction, the answer is -2/105

MathStep (Works offline)

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

Related: ⁴⁰/₈₄-¹⁸/₇₀ ²⁰/₈₄-³⁶/₇₀ ⁶⁰/₈₄-¹⁸/₇₀ ²⁰/₈₄-⁵⁴/₇₀ ²⁰/₈₄-⁹⁰/₇₀

Subtract Fractions Calculator