Answers

Subtract 18/64 from 90/20

1^st number: 4 10/20, 2^nd number: 18/64

90/20 - 18/64 is 135/32.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 64 is 320
   
   Next, find the equivalent fraction of both fractional numbers with denominator 320
2. For the 1st fraction, since 20 × 16 = 320,
   90/20 = 90 × 16/20 × 16 = 1440/320
3. Likewise, for the 2nd fraction, since 64 × 5 = 320,
   18/64 = 18 × 5/64 × 5 = 90/320
4. Subtract the two like fractions:
   1440/320 - 90/320 = 1440 - 90/320 = 1350/320
5. After reducing the fraction, the answer is 135/32
6. In mixed form: 47/32

MathStep (Works offline)

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

Related: ⁹⁰/₂₀-³⁶/₆₄ ⁹⁰/₄₀-¹⁸/₆₄ ⁹⁰/₂₀-⁵⁴/₆₄ ⁹⁰/₆₀-¹⁸/₆₄ ⁹⁰/₂₀-⁹⁰/₆₄

Subtract Fractions Calculator