Answers

Subtract 49/64 from 20/28

20/28 - 49/64 is -23/448.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 64 is 448
   
   Next, find the equivalent fraction of both fractional numbers with denominator 448
2. For the 1st fraction, since 28 × 16 = 448,
   20/28 = 20 × 16/28 × 16 = 320/448
3. Likewise, for the 2nd fraction, since 64 × 7 = 448,
   49/64 = 49 × 7/64 × 7 = 343/448
4. Subtract the two like fractions:
   320/448 - 343/448 = 320 - 343/448 = -23/448

MathStep (Works offline)

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

Related: ⁴⁰/₂₈-⁴⁹/₆₄ ²⁰/₂₈-⁹⁸/₆₄ ²⁰/₅₆-⁴⁹/₆₄ ⁶⁰/₂₈-⁴⁹/₆₄ ²⁰/₈₄-⁴⁹/₆₄

Subtract Fractions Calculator