Subtract 8/90 from 18/7
1st number: 2 4/7, 2nd number: 8/90
18/7 - 8/90 is 782/315.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 7 × 90 = 630,
18/7 = 18 × 90/7 × 90 = 1620/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
8/90 = 8 × 7/90 × 7 = 56/630 - Subtract the two like fractions:
1620/630 - 56/630 = 1620 - 56/630 = 1564/630 - After reducing the fraction, the answer is 782/315
- In mixed form: 2152/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/7-8/90 18/7-16/90 18/14-8/90 54/7-8/90 18/7-24/90 18/21-8/90 90/7-8/90 18/7-40/90 18/35-8/90 18/7-56/90 18/49-8/90