Answers

Subtract 72/80 from 90/12

1^st number: 7 6/12, 2^nd number: 72/80

90/12 - 72/80 is 33/5.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 80 is 240
   
   Next, find the equivalent fraction of both fractional numbers with denominator 240
2. For the 1st fraction, since 12 × 20 = 240,
   90/12 = 90 × 20/12 × 20 = 1800/240
3. Likewise, for the 2nd fraction, since 80 × 3 = 240,
   72/80 = 72 × 3/80 × 3 = 216/240
4. Subtract the two like fractions:
   1800/240 - 216/240 = 1800 - 216/240 = 1584/240
5. After reducing the fraction, the answer is 33/5
6. In mixed form: 63/5

MathStep (Works offline)

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

Related: ⁹⁰/₂₄-⁷²/₈₀ ⁹⁰/₃₆-⁷²/₈₀ ⁹⁰/₆₀-⁷²/₈₀ ⁹⁰/₈₄-⁷²/₈₀

Subtract Fractions Calculator