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