Subtract 8/18 from 3/72
3/72 - 8/18 is -29/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 18 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 72 × 1 = 72,
3/72 = 3 × 1/72 × 1 = 3/72 - Likewise, for the 2nd fraction, since 18 × 4 = 72,
8/18 = 8 × 4/18 × 4 = 32/72 - Subtract the two like fractions:
3/72 - 32/72 = 3 - 32/72 = -29/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/72-8/18 3/72-16/18 3/72-8/36 9/72-8/18 3/72-24/18 3/72-8/54 15/72-8/18 3/72-40/18 3/72-8/90 21/72-8/18 3/72-56/18