Answers

Subtract 42/35 from 40/84

1^st number: 40/84, 2^nd number: 1 7/35

40/84 - 42/35 is -76/105.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 35 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   40/84 = 40 × 5/84 × 5 = 200/420
3. Likewise, for the 2nd fraction, since 35 × 12 = 420,
   42/35 = 42 × 12/35 × 12 = 504/420
4. Subtract the two like fractions:
   200/420 - 504/420 = 200 - 504/420 = -304/420
5. After reducing the fraction, the answer is -76/105

MathStep (Works offline)

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

Related: ⁸⁰/₈₄-⁴²/₃₅ ⁴⁰/₈₄-⁸⁴/₃₅ ⁴⁰/₈₄-⁴²/₇₀

Subtract Fractions Calculator