Answers

Subtract 42/18 from 7/20

1^st number: 7/20, 2^nd number: 2 6/18

7/20 - 42/18 is -119/60.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 18 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 20 × 9 = 180,
   7/20 = 7 × 9/20 × 9 = 63/180
3. Likewise, for the 2nd fraction, since 18 × 10 = 180,
   42/18 = 42 × 10/18 × 10 = 420/180
4. Subtract the two like fractions:
   63/180 - 420/180 = 63 - 420/180 = -357/180
5. After reducing the fraction, the answer is -119/60

MathStep (Works offline)

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

Related: ¹⁴/₂₀-⁴²/₁₈ ⁷/₂₀-⁸⁴/₁₈ ⁷/₄₀-⁴²/₁₈ ⁷/₂₀-⁴²/₃₆ ²¹/₂₀-⁴²/₁₈ ⁷/₆₀-⁴²/₁₈ ⁷/₂₀-⁴²/₅₄ ³⁵/₂₀-⁴²/₁₈ ⁷/₂₀-⁴²/₉₀ ⁴⁹/₂₀-⁴²/₁₈

Subtract Fractions Calculator