Subtract 2/21 from 25/8
1st number: 3 1/8, 2nd number: 2/21
25/8 - 2/21 is 509/168.
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,
25/8 = 25 × 21/8 × 21 = 525/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
2/21 = 2 × 8/21 × 8 = 16/168 - Subtract the two like fractions:
525/168 - 16/168 = 525 - 16/168 = 509/168 - In mixed form: 35/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/8-2/21 25/8-4/21 25/16-2/21 25/8-2/42 75/8-2/21 25/8-6/21 25/24-2/21 25/8-2/63 25/8-10/21 25/40-2/21 25/8-14/21 25/56-2/21