Subtract 4/90 from 27/21
1st number: 1 6/21, 2nd number: 4/90
27/21 - 4/90 is 391/315.
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,
27/21 = 27 × 30/21 × 30 = 810/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
4/90 = 4 × 7/90 × 7 = 28/630 - Subtract the two like fractions:
810/630 - 28/630 = 810 - 28/630 = 782/630 - After reducing the fraction, the answer is 391/315
- In mixed form: 176/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21-4/90 27/21-8/90 27/42-4/90 81/21-4/90 27/21-12/90 27/63-4/90 27/21-20/90 27/21-28/90