Subtract 7/40 from 21/36
21/36 - 7/40 is 49/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 36 × 10 = 360,
21/36 = 21 × 10/36 × 10 = 210/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
7/40 = 7 × 9/40 × 9 = 63/360 - Subtract the two like fractions:
210/360 - 63/360 = 210 - 63/360 = 147/360 - After reducing the fraction, the answer is 49/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36-7/40 21/36-14/40 21/72-7/40 21/36-7/80 63/36-7/40 21/36-21/40 21/36-35/40 21/36-49/40