Subtract 8/80 from 20/72
20/72 - 8/80 is 8/45.
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,
20/72 = 20 × 10/72 × 10 = 200/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
8/80 = 8 × 9/80 × 9 = 72/720 - Subtract the two like fractions:
200/720 - 72/720 = 200 - 72/720 = 128/720 - After reducing the fraction, the answer is 8/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/72-8/80 20/72-16/80 60/72-8/80 20/72-24/80 20/72-40/80 20/72-56/80