Subtract 90/40 from 45/56
1st number: 45/56, 2nd number: 2 10/40
45/56 - 90/40 is -81/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 56 × 5 = 280,
45/56 = 45 × 5/56 × 5 = 225/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
90/40 = 90 × 7/40 × 7 = 630/280 - Subtract the two like fractions:
225/280 - 630/280 = 225 - 630/280 = -405/280 - After reducing the fraction, the answer is -81/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/56-90/40 45/56-90/80