Subtract 18/25 from 28/21
1st number: 1 7/21, 2nd number: 18/25
28/21 - 18/25 is 46/75.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 25 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
28/21 = 28 × 25/21 × 25 = 700/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
18/25 = 18 × 21/25 × 21 = 378/525 - Subtract the two like fractions:
700/525 - 378/525 = 700 - 378/525 = 322/525 - After reducing the fraction, the answer is 46/75
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-18/25 28/21-36/25 28/42-18/25 28/21-18/50 84/21-18/25 28/21-54/25 28/63-18/25 28/21-18/75 28/21-90/25