Subtract 90/5 from 81/16
1st number: 5 1/16, 2nd number: 18 0/5
81/16 - 90/5 is -207/16.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 5 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 16 × 5 = 80,
81/16 = 81 × 5/16 × 5 = 405/80 - Likewise, for the 2nd fraction, since 5 × 16 = 80,
90/5 = 90 × 16/5 × 16 = 1440/80 - Subtract the two like fractions:
405/80 - 1440/80 = 405 - 1440/80 = -1035/80 - After reducing the fraction, the answer is -207/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/32-90/5 81/16-90/10 81/48-90/5 81/16-90/15 81/80-90/5 81/16-90/25 81/16-90/35