Subtract 18/20 from 70/75
70/75 - 18/20 is 1/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 20 is 300
Next, find the equivalent fraction of both fractional numbers with denominator 300 - For the 1st fraction, since 75 × 4 = 300,
70/75 = 70 × 4/75 × 4 = 280/300 - Likewise, for the 2nd fraction, since 20 × 15 = 300,
18/20 = 18 × 15/20 × 15 = 270/300 - Subtract the two like fractions:
280/300 - 270/300 = 280 - 270/300 = 10/300 - After reducing the fraction, the answer is 1/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/75-36/20 70/75-18/40 70/75-54/20 70/75-18/60 70/75-90/20