Answers

Subtract 90/81 from 80/75

1^st number: 1 5/75, 2^nd number: 1 9/81

80/75 - 90/81 is -2/45.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 75 and 81 is 2025
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2025
2. For the 1st fraction, since 75 × 27 = 2025,
   80/75 = 80 × 27/75 × 27 = 2160/2025
3. Likewise, for the 2nd fraction, since 81 × 25 = 2025,
   90/81 = 90 × 25/81 × 25 = 2250/2025
4. Subtract the two like fractions:
   2160/2025 - 2250/2025 = 2160 - 2250/2025 = -90/2025
5. After reducing the fraction, the answer is -2/45

MathStep (Works offline)

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

Related:

Subtract Fractions Calculator