Subtract 21/75 from 18/42
18/42 - 21/75 is 26/175.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 75 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 42 × 25 = 1050,
18/42 = 18 × 25/42 × 25 = 450/1050 - Likewise, for the 2nd fraction, since 75 × 14 = 1050,
21/75 = 21 × 14/75 × 14 = 294/1050 - Subtract the two like fractions:
450/1050 - 294/1050 = 450 - 294/1050 = 156/1050 - After reducing the fraction, the answer is 26/175
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42-21/75 18/42-42/75 18/84-21/75 54/42-21/75 18/42-63/75 90/42-21/75