Answers

Subtract 98/90 from 15/18

1^st number: 15/18, 2^nd number: 1 8/90

15/18 - 98/90 is -23/90.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 18 and 90 is 90
   
   Next, find the equivalent fraction of both fractional numbers with denominator 90
2. For the 1st fraction, since 18 × 5 = 90,
   15/18 = 15 × 5/18 × 5 = 75/90
3. Likewise, for the 2nd fraction, since 90 × 1 = 90,
   98/90 = 98 × 1/90 × 1 = 98/90
4. Subtract the two like fractions:
   75/90 - 98/90 = 75 - 98/90 = -23/90

MathStep (Works offline)

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

Related: ³⁰/₁₈-⁹⁸/₉₀ ¹⁵/₃₆-⁹⁸/₉₀ ⁴⁵/₁₈-⁹⁸/₉₀ ¹⁵/₅₄-⁹⁸/₉₀ ⁷⁵/₁₈-⁹⁸/₉₀ ¹⁵/₉₀-⁹⁸/₉₀

Subtract Fractions Calculator