Subtract 70/72 from 40/75
40/75 - 70/72 is -79/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 72 is 1800
Next, find the equivalent fraction of both fractional numbers with denominator 1800 - For the 1st fraction, since 75 × 24 = 1800,
40/75 = 40 × 24/75 × 24 = 960/1800 - Likewise, for the 2nd fraction, since 72 × 25 = 1800,
70/72 = 70 × 25/72 × 25 = 1750/1800 - Subtract the two like fractions:
960/1800 - 1750/1800 = 960 - 1750/1800 = -790/1800 - After reducing the fraction, the answer is -79/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/75-70/72