Subtract 5/90 from 21/16
1st number: 1 5/16, 2nd number: 5/90
21/16 - 5/90 is 181/144.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 16 × 45 = 720,
21/16 = 21 × 45/16 × 45 = 945/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
5/90 = 5 × 8/90 × 8 = 40/720 - Subtract the two like fractions:
945/720 - 40/720 = 945 - 40/720 = 905/720 - After reducing the fraction, the answer is 181/144
- In mixed form: 137/144
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/16-5/90 21/16-10/90 21/32-5/90 63/16-5/90 21/16-15/90 21/48-5/90 21/16-25/90 21/80-5/90 21/16-35/90