Answers

Subtract 21/64 from 8/28

8/28 - 21/64 is -19/448.

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,
   8/28 = 8 × 16/28 × 16 = 128/448
3. Likewise, for the 2nd fraction, since 64 × 7 = 448,
   21/64 = 21 × 7/64 × 7 = 147/448
4. Subtract the two like fractions:
   128/448 - 147/448 = 128 - 147/448 = -19/448

MathStep (Works offline)

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

Related: ¹⁶/₂₈-²¹/₆₄ ⁸/₂₈-⁴²/₆₄ ⁸/₅₆-²¹/₆₄ ²⁴/₂₈-²¹/₆₄ ⁸/₂₈-⁶³/₆₄ ⁸/₈₄-²¹/₆₄ ⁴⁰/₂₈-²¹/₆₄ ⁵⁶/₂₈-²¹/₆₄

Subtract Fractions Calculator