Answers

Subtract 15/8 from 12/18

1^st number: 12/18, 2^nd number: 1 7/8

12/18 - 15/8 is -29/24.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 8 is 72
   
   Next, find the equivalent fraction of both fractional numbers with denominator 72
2. For the 1st fraction, since 18 × 4 = 72,
   12/18 = 12 × 4/18 × 4 = 48/72
3. Likewise, for the 2nd fraction, since 8 × 9 = 72,
   15/8 = 15 × 9/8 × 9 = 135/72
4. Subtract the two like fractions:
   48/72 - 135/72 = 48 - 135/72 = -87/72
5. After reducing the fraction, the answer is -29/24

MathStep (Works offline)

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

Related: ²⁴/₁₈-¹⁵/₈ ¹²/₁₈-³⁰/₈ ¹²/₃₆-¹⁵/₈ ¹²/₁₈-¹⁵/₁₆ ³⁶/₁₈-¹⁵/₈ ¹²/₁₈-⁴⁵/₈ ¹²/₅₄-¹⁵/₈ ¹²/₁₈-¹⁵/₂₄ ⁶⁰/₁₈-¹⁵/₈ ¹²/₁₈-⁷⁵/₈ ¹²/₉₀-¹⁵/₈ ¹²/₁₈-¹⁵/₄₀ ⁸⁴/₁₈-¹⁵/₈ ¹²/₁₈-¹⁵/₅₆

Subtract Fractions Calculator