Subtract 90/21 from 90/16
1st number: 5 10/16, 2nd number: 4 6/21
90/16 - 90/21 is 75/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 21 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 16 × 21 = 336,
90/16 = 90 × 21/16 × 21 = 1890/336 - Likewise, for the 2nd fraction, since 21 × 16 = 336,
90/21 = 90 × 16/21 × 16 = 1440/336 - Subtract the two like fractions:
1890/336 - 1440/336 = 1890 - 1440/336 = 450/336 - After reducing the fraction, the answer is 75/56
- In mixed form: 119/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/32-90/21 90/16-90/42 90/48-90/21 90/16-90/63 90/80-90/21