Subtract 5/72 from 7/90
7/90 - 5/72 is 1/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
7/90 = 7 × 4/90 × 4 = 28/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
5/72 = 5 × 5/72 × 5 = 25/360 - Subtract the two like fractions:
28/360 - 25/360 = 28 - 25/360 = 3/360 - After reducing the fraction, the answer is 1/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/90-5/72 7/90-10/72 21/90-5/72 7/90-15/72 35/90-5/72 7/90-25/72 49/90-5/72 7/90-35/72