Subtract 9/15 from 10/40
10/40 - 9/15 is -7/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
10/40 = 10 × 3/40 × 3 = 30/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
9/15 = 9 × 8/15 × 8 = 72/120 - Subtract the two like fractions:
30/120 - 72/120 = 30 - 72/120 = -42/120 - After reducing the fraction, the answer is -7/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-9/15 10/40-18/15 10/80-9/15 10/40-9/30 30/40-9/15 10/40-27/15 10/40-9/45 50/40-9/15 10/40-45/15 10/40-9/75 70/40-9/15 10/40-63/15