Subtract 16/90 from 4/21
4/21 - 16/90 is 4/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
4/21 = 4 × 30/21 × 30 = 120/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
16/90 = 16 × 7/90 × 7 = 112/630 - Subtract the two like fractions:
120/630 - 112/630 = 120 - 112/630 = 8/630 - After reducing the fraction, the answer is 4/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-16/90 4/21-32/90 4/42-16/90 12/21-16/90 4/21-48/90 4/63-16/90 20/21-16/90 4/21-80/90 28/21-16/90