Subtract 8/90 from 21/4
1st number: 5 1/4, 2nd number: 8/90
21/4 - 8/90 is 929/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 4 × 45 = 180,
21/4 = 21 × 45/4 × 45 = 945/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
8/90 = 8 × 2/90 × 2 = 16/180 - Subtract the two like fractions:
945/180 - 16/180 = 945 - 16/180 = 929/180 - In mixed form: 529/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-8/90 21/4-16/90 21/8-8/90 63/4-8/90 21/4-24/90 21/12-8/90 21/4-40/90 21/20-8/90 21/4-56/90 21/28-8/90