Answers

Subtract 35/18 from 42/40

1^st number: 1 2/40, 2^nd number: 1 17/18

42/40 - 35/18 is -161/180.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 40 and 18 is 360
   
   Next, find the equivalent fraction of both fractional numbers with denominator 360
2. For the 1st fraction, since 40 × 9 = 360,
   42/40 = 42 × 9/40 × 9 = 378/360
3. Likewise, for the 2nd fraction, since 18 × 20 = 360,
   35/18 = 35 × 20/18 × 20 = 700/360
4. Subtract the two like fractions:
   378/360 - 700/360 = 378 - 700/360 = -322/360
5. After reducing the fraction, the answer is -161/180

MathStep (Works offline)

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

Related: ⁸⁴/₄₀-³⁵/₁₈ ⁴²/₄₀-⁷⁰/₁₈ ⁴²/₈₀-³⁵/₁₈ ⁴²/₄₀-³⁵/₃₆ ⁴²/₄₀-³⁵/₅₄ ⁴²/₄₀-³⁵/₉₀

Subtract Fractions Calculator