Answers

Subtract 90/25 from 81/4

1^st number: 20 1/4, 2^nd number: 3 15/25

81/4 - 90/25 is 333/20.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 25 is 100
   
   Next, find the equivalent fraction of both fractional numbers with denominator 100
2. For the 1st fraction, since 4 × 25 = 100,
   81/4 = 81 × 25/4 × 25 = 2025/100
3. Likewise, for the 2nd fraction, since 25 × 4 = 100,
   90/25 = 90 × 4/25 × 4 = 360/100
4. Subtract the two like fractions:
   2025/100 - 360/100 = 2025 - 360/100 = 1665/100
5. After reducing the fraction, the answer is 333/20
6. In mixed form: 1613/20

MathStep (Works offline)

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

Related: ⁸¹/₈-⁹⁰/₂₅ ⁸¹/₄-⁹⁰/₅₀ ⁸¹/₁₂-⁹⁰/₂₅ ⁸¹/₄-⁹⁰/₇₅ ⁸¹/₂₀-⁹⁰/₂₅ ⁸¹/₂₈-⁹⁰/₂₅

Subtract Fractions Calculator