Answers

Subtract 45/25 from 18/84

1^st number: 18/84, 2^nd number: 1 20/25

18/84 - 45/25 is -111/70.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 25 is 2100
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2100
2. For the 1st fraction, since 84 × 25 = 2100,
   18/84 = 18 × 25/84 × 25 = 450/2100
3. Likewise, for the 2nd fraction, since 25 × 84 = 2100,
   45/25 = 45 × 84/25 × 84 = 3780/2100
4. Subtract the two like fractions:
   450/2100 - 3780/2100 = 450 - 3780/2100 = -3330/2100
5. After reducing the fraction, the answer is -111/70

MathStep (Works offline)

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

Related: ³⁶/₈₄-⁴⁵/₂₅ ¹⁸/₈₄-⁹⁰/₂₅ ¹⁸/₈₄-⁴⁵/₅₀ ⁵⁴/₈₄-⁴⁵/₂₅ ¹⁸/₈₄-⁴⁵/₇₅ ⁹⁰/₈₄-⁴⁵/₂₅

Subtract Fractions Calculator