Subtract 8/45 from 9/90
9/90 - 8/45 is -7/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
9/90 = 9 × 1/90 × 1 = 9/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
8/45 = 8 × 2/45 × 2 = 16/90 - Subtract the two like fractions:
9/90 - 16/90 = 9 - 16/90 = -7/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/90-8/45 9/90-16/45 9/90-8/90 27/90-8/45 9/90-24/45 45/90-8/45 9/90-40/45 63/90-8/45 9/90-56/45