Subtract 7/45 from 7/90
7/90 - 7/45 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,
7/90 = 7 × 1/90 × 1 = 7/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
7/45 = 7 × 2/45 × 2 = 14/90 - Subtract the two like fractions:
7/90 - 14/90 = 7 - 14/90 = -7/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/90-7/45 7/90-14/45 7/90-7/90 21/90-7/45 7/90-21/45 35/90-7/45 7/90-35/45 49/90-7/45 7/90-49/45