Answers

Subtract 98/80 from 25/42

1^st number: 25/42, 2^nd number: 1 18/80

25/42 - 98/80 is -529/840.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 80 is 1680
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1680
2. For the 1st fraction, since 42 × 40 = 1680,
   25/42 = 25 × 40/42 × 40 = 1000/1680
3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
   98/80 = 98 × 21/80 × 21 = 2058/1680
4. Subtract the two like fractions:
   1000/1680 - 2058/1680 = 1000 - 2058/1680 = -1058/1680
5. After reducing the fraction, the answer is -529/840

MathStep (Works offline)

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

Related: ⁵⁰/₄₂-⁹⁸/₈₀ ²⁵/₈₄-⁹⁸/₈₀ ⁷⁵/₄₂-⁹⁸/₈₀

Subtract Fractions Calculator