Answers

Subtract 81/16 from 20/84

1^st number: 20/84, 2^nd number: 5 1/16

20/84 - 81/16 is -1621/336.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 16 is 336
   
   Next, find the equivalent fraction of both fractional numbers with denominator 336
2. For the 1st fraction, since 84 × 4 = 336,
   20/84 = 20 × 4/84 × 4 = 80/336
3. Likewise, for the 2nd fraction, since 16 × 21 = 336,
   81/16 = 81 × 21/16 × 21 = 1701/336
4. Subtract the two like fractions:
   80/336 - 1701/336 = 80 - 1701/336 = -1621/336

MathStep (Works offline)

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

Related: ⁴⁰/₈₄-⁸¹/₁₆ ²⁰/₈₄-⁸¹/₃₂ ⁶⁰/₈₄-⁸¹/₁₆ ²⁰/₈₄-⁸¹/₄₈ ²⁰/₈₄-⁸¹/₈₀

Subtract Fractions Calculator