Subtract 21/75 from 18/84
18/84 - 21/75 is -23/350.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 75 is 2100
Next, find the equivalent fraction of both fractional numbers with denominator 2100 - For the 1st fraction, since 84 × 25 = 2100,
18/84 = 18 × 25/84 × 25 = 450/2100 - Likewise, for the 2nd fraction, since 75 × 28 = 2100,
21/75 = 21 × 28/75 × 28 = 588/2100 - Subtract the two like fractions:
450/2100 - 588/2100 = 450 - 588/2100 = -138/2100 - After reducing the fraction, the answer is -23/350
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84-21/75 18/84-42/75 54/84-21/75 18/84-63/75 90/84-21/75