Subtract 18/36 from 7/40
7/40 - 18/36 is -13/40.
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,
18/36 = 18 × 10/36 × 10 = 180/360 - Subtract the two like fractions:
63/360 - 180/360 = 63 - 180/360 = -117/360 - After reducing the fraction, the answer is -13/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/40-18/36 7/80-18/36 7/40-18/72 21/40-18/36 7/40-54/36 35/40-18/36 7/40-90/36 49/40-18/36