Answers

Subtract 9/42 from 9/18

9/18 - 9/42 is 2/7.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 42 is 126
   
   Next, find the equivalent fraction of both fractional numbers with denominator 126
2. For the 1st fraction, since 18 × 7 = 126,
   9/18 = 9 × 7/18 × 7 = 63/126
3. Likewise, for the 2nd fraction, since 42 × 3 = 126,
   9/42 = 9 × 3/42 × 3 = 27/126
4. Subtract the two like fractions:
   63/126 - 27/126 = 63 - 27/126 = 36/126
5. After reducing the fraction, the answer is 2/7

MathStep (Works offline)

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

Related: ⁹/₁₈-¹⁸/₄₂ ⁹/₃₆-⁹/₄₂ ⁹/₁₈-⁹/₈₄ ²⁷/₁₈-⁹/₄₂ ⁹/₁₈-²⁷/₄₂ ⁹/₅₄-⁹/₄₂ ⁴⁵/₁₈-⁹/₄₂ ⁹/₁₈-⁴⁵/₄₂ ⁹/₉₀-⁹/₄₂ ⁶³/₁₈-⁹/₄₂ ⁹/₁₈-⁶³/₄₂

Subtract Fractions Calculator