Subtract 10/80 from 40/72
40/72 - 10/80 is 31/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 72 × 10 = 720,
40/72 = 40 × 10/72 × 10 = 400/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
10/80 = 10 × 9/80 × 9 = 90/720 - Subtract the two like fractions:
400/720 - 90/720 = 400 - 90/720 = 310/720 - After reducing the fraction, the answer is 31/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/72-10/80 40/72-20/80 40/72-30/80 40/72-50/80 40/72-70/80