Subtract 16/21 from 16/90
16/90 - 16/21 is -184/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
16/90 = 16 × 7/90 × 7 = 112/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
16/21 = 16 × 30/21 × 30 = 480/630 - Subtract the two like fractions:
112/630 - 480/630 = 112 - 480/630 = -368/630 - After reducing the fraction, the answer is -184/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/90-16/21 16/90-32/21 16/90-16/42 48/90-16/21 16/90-48/21 16/90-16/63 80/90-16/21 16/90-80/21