Subtract 25/90 from 21/8
1st number: 2 5/8, 2nd number: 25/90
21/8 - 25/90 is 169/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 8 × 45 = 360,
21/8 = 21 × 45/8 × 45 = 945/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
25/90 = 25 × 4/90 × 4 = 100/360 - Subtract the two like fractions:
945/360 - 100/360 = 945 - 100/360 = 845/360 - After reducing the fraction, the answer is 169/72
- In mixed form: 225/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-25/90 21/8-50/90 21/16-25/90 63/8-25/90 21/8-75/90 21/24-25/90 21/40-25/90 21/56-25/90