Subtract 18/45 from 8/72
8/72 - 18/45 is -13/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 45 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 45 × 8 = 360,
18/45 = 18 × 8/45 × 8 = 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: 16/72-18/45 8/72-36/45 8/72-18/90 24/72-18/45 8/72-54/45 40/72-18/45 8/72-90/45 56/72-18/45