Subtract 4/72 from 75/90
75/90 - 4/72 is 7/9.
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,
75/90 = 75 × 4/90 × 4 = 300/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
4/72 = 4 × 5/72 × 5 = 20/360 - Subtract the two like fractions:
300/360 - 20/360 = 300 - 20/360 = 280/360 - After reducing the fraction, the answer is 7/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 75/90-8/72 75/90-12/72 75/90-20/72 75/90-28/72