Subtract 1/90 from 3/72
3/72 - 1/90 is 11/360.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
3/72 = 3 × 5/72 × 5 = 15/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
1/90 = 1 × 4/90 × 4 = 4/360 - Subtract the two like fractions:
15/360 - 4/360 = 15 - 4/360 = 11/360
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/72-1/90 3/72-2/90 9/72-1/90 3/72-3/90 15/72-1/90 3/72-5/90 21/72-1/90 3/72-7/90