Subtract 7/8 from 9/90
9/90 - 7/8 is -31/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
9/90 = 9 × 4/90 × 4 = 36/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
7/8 = 7 × 45/8 × 45 = 315/360 - Subtract the two like fractions:
36/360 - 315/360 = 36 - 315/360 = -279/360 - After reducing the fraction, the answer is -31/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/90-7/8 9/90-14/8 9/90-7/16 27/90-7/8 9/90-21/8 9/90-7/24 45/90-7/8 9/90-35/8 9/90-7/40 63/90-7/8 9/90-49/8 9/90-7/56