Answers

Subtract 75/8 from 21/18

1^st number: 1 3/18, 2^nd number: 9 3/8

21/18 - 75/8 is -197/24.

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,
   21/18 = 21 × 4/18 × 4 = 84/72
3. Likewise, for the 2nd fraction, since 8 × 9 = 72,
   75/8 = 75 × 9/8 × 9 = 675/72
4. Subtract the two like fractions:
   84/72 - 675/72 = 84 - 675/72 = -591/72
5. After reducing the fraction, the answer is -197/24

MathStep (Works offline)

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

Related: ⁴²/₁₈-⁷⁵/₈ ²¹/₃₆-⁷⁵/₈ ²¹/₁₈-⁷⁵/₁₆ ⁶³/₁₈-⁷⁵/₈ ²¹/₅₄-⁷⁵/₈ ²¹/₁₈-⁷⁵/₂₄ ²¹/₉₀-⁷⁵/₈ ²¹/₁₈-⁷⁵/₄₀ ²¹/₁₈-⁷⁵/₅₆

Subtract Fractions Calculator