Subtract 8/20 from 8/72
8/72 - 8/20 is -13/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 20 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
8/72 = 8 × 5/72 × 5 = 40/360 - Likewise, for the 2nd fraction, since 20 × 18 = 360,
8/20 = 8 × 18/20 × 18 = 144/360 - Subtract the two like fractions:
40/360 - 144/360 = 40 - 144/360 = -104/360 - After reducing the fraction, the answer is -13/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/72-8/20 8/72-16/20 8/72-8/40 24/72-8/20 8/72-24/20 8/72-8/60 40/72-8/20 8/72-40/20 56/72-8/20 8/72-56/20