Answers

Subtract 84/18 from 20/15

1^st number: 1 5/15, 2^nd number: 4 12/18

20/15 - 84/18 is -10/3.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 18 is 90
   
   Next, find the equivalent fraction of both fractional numbers with denominator 90
2. For the 1st fraction, since 15 × 6 = 90,
   20/15 = 20 × 6/15 × 6 = 120/90
3. Likewise, for the 2nd fraction, since 18 × 5 = 90,
   84/18 = 84 × 5/18 × 5 = 420/90
4. Subtract the two like fractions:
   120/90 - 420/90 = 120 - 420/90 = -300/90
5. After reducing the fraction, the answer is -10/3

MathStep (Works offline)

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

Related: ⁴⁰/₁₅-⁸⁴/₁₈ ²⁰/₃₀-⁸⁴/₁₈ ²⁰/₁₅-⁸⁴/₃₆ ⁶⁰/₁₅-⁸⁴/₁₈ ²⁰/₄₅-⁸⁴/₁₈ ²⁰/₁₅-⁸⁴/₅₄ ²⁰/₇₅-⁸⁴/₁₈ ²⁰/₁₅-⁸⁴/₉₀

Subtract Fractions Calculator