Subtract 15/8 from 7/40
1st number: 7/40, 2nd number: 1 7/8
7/40 - 15/8 is -17/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
7/40 = 7 × 1/40 × 1 = 7/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
15/8 = 15 × 5/8 × 5 = 75/40 - Subtract the two like fractions:
7/40 - 75/40 = 7 - 75/40 = -68/40 - After reducing the fraction, the answer is -17/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/40-15/8 7/40-30/8 7/80-15/8 7/40-15/16 21/40-15/8 7/40-45/8 7/40-15/24 35/40-15/8 7/40-75/8 7/40-15/40 49/40-15/8 7/40-15/56