Subtract 81/36 from 7/40
1st number: 7/40, 2nd number: 2 9/36
7/40 - 81/36 is -83/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 36 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
7/40 = 7 × 9/40 × 9 = 63/360 - Likewise, for the 2nd fraction, since 36 × 10 = 360,
81/36 = 81 × 10/36 × 10 = 810/360 - Subtract the two like fractions:
63/360 - 810/360 = 63 - 810/360 = -747/360 - After reducing the fraction, the answer is -83/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/40-81/36 7/80-81/36 7/40-81/72 21/40-81/36 35/40-81/36 49/40-81/36