Subtract 8/14 from 7/90
7/90 - 8/14 is -311/630.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 14 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
7/90 = 7 × 7/90 × 7 = 49/630 - Likewise, for the 2nd fraction, since 14 × 45 = 630,
8/14 = 8 × 45/14 × 45 = 360/630 - Subtract the two like fractions:
49/630 - 360/630 = 49 - 360/630 = -311/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/90-8/14 7/90-16/14 7/90-8/28 21/90-8/14 7/90-24/14 7/90-8/42 35/90-8/14 7/90-40/14 7/90-8/70 49/90-8/14 7/90-56/14 7/90-8/98