Subtract 9/40 from 7/8
7/8 - 9/40 is 13/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 8 × 5 = 40,
7/8 = 7 × 5/8 × 5 = 35/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
9/40 = 9 × 1/40 × 1 = 9/40 - Subtract the two like fractions:
35/40 - 9/40 = 35 - 9/40 = 26/40 - After reducing the fraction, the answer is 13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/8-9/40 7/8-18/40 7/16-9/40 7/8-9/80 21/8-9/40 7/8-27/40 7/24-9/40 35/8-9/40 7/8-45/40 7/40-9/40 49/8-9/40 7/8-63/40 7/56-9/40