Subtract 81/28 from 7/40
1st number: 7/40, 2nd number: 2 25/28
7/40 - 81/28 is -761/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 28 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
7/40 = 7 × 7/40 × 7 = 49/280 - Likewise, for the 2nd fraction, since 28 × 10 = 280,
81/28 = 81 × 10/28 × 10 = 810/280 - Subtract the two like fractions:
49/280 - 810/280 = 49 - 810/280 = -761/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/40-81/28 7/80-81/28 7/40-81/56 21/40-81/28 7/40-81/84 35/40-81/28 49/40-81/28