Subtract 21/18 from 25/84
1st number: 25/84, 2nd number: 1 3/18
25/84 - 21/18 is -73/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 18 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
25/84 = 25 × 3/84 × 3 = 75/252 - Likewise, for the 2nd fraction, since 18 × 14 = 252,
21/18 = 21 × 14/18 × 14 = 294/252 - Subtract the two like fractions:
75/252 - 294/252 = 75 - 294/252 = -219/252 - After reducing the fraction, the answer is -73/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/84-21/18 25/84-42/18 25/84-21/36 75/84-21/18 25/84-63/18 25/84-21/54 25/84-21/90