Subtract 90/16 from 40/21
1st number: 1 19/21, 2nd number: 5 10/16
40/21 - 90/16 is -625/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 16 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 21 × 16 = 336,
40/21 = 40 × 16/21 × 16 = 640/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
90/16 = 90 × 21/16 × 21 = 1890/336 - Subtract the two like fractions:
640/336 - 1890/336 = 640 - 1890/336 = -1250/336 - After reducing the fraction, the answer is -625/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-90/16 40/42-90/16 40/21-90/32 40/63-90/16 40/21-90/48 40/21-90/80