Answers

Subtract 90/7 from 90/12

1^st number: 7 6/12, 2^nd number: 12 6/7

90/12 - 90/7 is -75/14.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 7 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 12 × 7 = 84,
   90/12 = 90 × 7/12 × 7 = 630/84
3. Likewise, for the 2nd fraction, since 7 × 12 = 84,
   90/7 = 90 × 12/7 × 12 = 1080/84
4. Subtract the two like fractions:
   630/84 - 1080/84 = 630 - 1080/84 = -450/84
5. After reducing the fraction, the answer is -75/14

MathStep (Works offline)

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

Related: ⁹⁰/₂₄-⁹⁰/₇ ⁹⁰/₁₂-⁹⁰/₁₄ ⁹⁰/₃₆-⁹⁰/₇ ⁹⁰/₁₂-⁹⁰/₂₁ ⁹⁰/₆₀-⁹⁰/₇ ⁹⁰/₁₂-⁹⁰/₃₅ ⁹⁰/₈₄-⁹⁰/₇ ⁹⁰/₁₂-⁹⁰/₄₉

Subtract Fractions Calculator