Subtract 25/21 from 18/8
1st number: 2 2/8, 2nd number: 1 4/21
18/8 - 25/21 is 89/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
18/8 = 18 × 21/8 × 21 = 378/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
25/21 = 25 × 8/21 × 8 = 200/168 - Subtract the two like fractions:
378/168 - 200/168 = 378 - 200/168 = 178/168 - After reducing the fraction, the answer is 89/84
- In mixed form: 15/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/8-25/21 18/8-50/21 18/16-25/21 18/8-25/42 54/8-25/21 18/8-75/21 18/24-25/21 18/8-25/63 90/8-25/21 18/40-25/21 18/56-25/21