Answers

Subtract 4/8 from 7/81

7/81 - 4/8 is -67/162.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 8 is 648
   
   Next, find the equivalent fraction of both fractional numbers with denominator 648
2. For the 1st fraction, since 81 × 8 = 648,
   7/81 = 7 × 8/81 × 8 = 56/648
3. Likewise, for the 2nd fraction, since 8 × 81 = 648,
   4/8 = 4 × 81/8 × 81 = 324/648
4. Subtract the two like fractions:
   56/648 - 324/648 = 56 - 324/648 = -268/648
5. After reducing the fraction, the answer is -67/162

MathStep (Works offline)

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

Related: ¹⁴/₈₁-⁴/₈ ⁷/₈₁-⁴/₁₆ ²¹/₈₁-⁴/₈ ⁷/₈₁-¹²/₈ ⁷/₈₁-⁴/₂₄ ³⁵/₈₁-⁴/₈ ⁷/₈₁-²⁰/₈ ⁷/₈₁-⁴/₄₀ ⁴⁹/₈₁-⁴/₈ ⁷/₈₁-²⁸/₈ ⁷/₈₁-⁴/₅₆

Subtract Fractions Calculator