Answers

Subtract 81/40 from 10/84

1^st number: 10/84, 2^nd number: 2 1/40

10/84 - 81/40 is -1601/840.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 40 is 840
   
   Next, find the equivalent fraction of both fractional numbers with denominator 840
2. For the 1st fraction, since 84 × 10 = 840,
   10/84 = 10 × 10/84 × 10 = 100/840
3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
   81/40 = 81 × 21/40 × 21 = 1701/840
4. Subtract the two like fractions:
   100/840 - 1701/840 = 100 - 1701/840 = -1601/840

MathStep (Works offline)

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

Related: ²⁰/₈₄-⁸¹/₄₀ ¹⁰/₈₄-⁸¹/₈₀ ³⁰/₈₄-⁸¹/₄₀ ⁵⁰/₈₄-⁸¹/₄₀ ⁷⁰/₈₄-⁸¹/₄₀

Subtract Fractions Calculator