Subtract 21/18 from 18/25
1st number: 18/25, 2nd number: 1 3/18
18/25 - 21/18 is -67/150.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 18 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 25 × 18 = 450,
18/25 = 18 × 18/25 × 18 = 324/450 - Likewise, for the 2nd fraction, since 18 × 25 = 450,
21/18 = 21 × 25/18 × 25 = 525/450 - Subtract the two like fractions:
324/450 - 525/450 = 324 - 525/450 = -201/450 - After reducing the fraction, the answer is -67/150
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/25-21/18 18/25-42/18 18/50-21/18 18/25-21/36 54/25-21/18 18/25-63/18 18/75-21/18 18/25-21/54 90/25-21/18 18/25-21/90