Subtract 90/81 from 40/25
1st number: 1 15/25, 2nd number: 1 9/81
40/25 - 90/81 is 22/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 81 is 2025
Next, find the equivalent fraction of both fractional numbers with denominator 2025 - For the 1st fraction, since 25 × 81 = 2025,
40/25 = 40 × 81/25 × 81 = 3240/2025 - Likewise, for the 2nd fraction, since 81 × 25 = 2025,
90/81 = 90 × 25/81 × 25 = 2250/2025 - Subtract the two like fractions:
3240/2025 - 2250/2025 = 3240 - 2250/2025 = 990/2025 - After reducing the fraction, the answer is 22/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/25-90/81 40/50-90/81 40/75-90/81