Subtract 90/40 from 5/7
1st number: 5/7, 2nd number: 2 10/40
5/7 - 90/40 is -43/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
5/7 = 5 × 40/7 × 40 = 200/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
90/40 = 90 × 7/40 × 7 = 630/280 - Subtract the two like fractions:
200/280 - 630/280 = 200 - 630/280 = -430/280 - After reducing the fraction, the answer is -43/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/7-90/40 5/14-90/40 5/7-90/80 15/7-90/40 5/21-90/40 25/7-90/40 5/35-90/40 35/7-90/40 5/49-90/40