Subtract 40/90 from 7/8
7/8 - 40/90 is 31/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 8 × 45 = 360,
7/8 = 7 × 45/8 × 45 = 315/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
40/90 = 40 × 4/90 × 4 = 160/360 - Subtract the two like fractions:
315/360 - 160/360 = 315 - 160/360 = 155/360 - After reducing the fraction, the answer is 31/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/8-40/90 7/8-80/90 7/16-40/90 21/8-40/90 7/24-40/90 35/8-40/90 7/40-40/90 49/8-40/90 7/56-40/90