Answers

Subtract 40/18 from 20/63

1^st number: 20/63, 2^nd number: 2 4/18

20/63 - 40/18 is -40/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 18 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 63 × 2 = 126,
   20/63 = 20 × 2/63 × 2 = 40/126
3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
   40/18 = 40 × 7/18 × 7 = 280/126
4. Subtract the two like fractions:
   40/126 - 280/126 = 40 - 280/126 = -240/126
5. After reducing the fraction, the answer is -40/21

MathStep (Works offline)

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

Related: ⁴⁰/₆₃-⁴⁰/₁₈ ²⁰/₆₃-⁸⁰/₁₈ ²⁰/₆₃-⁴⁰/₃₆ ⁶⁰/₆₃-⁴⁰/₁₈ ²⁰/₆₃-⁴⁰/₅₄ ²⁰/₆₃-⁴⁰/₉₀

Subtract Fractions Calculator