Subtract 90/40 from 18/9
1st number: 2 0/9, 2nd number: 2 10/40
18/9 - 90/40 is -1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 9 × 40 = 360,
18/9 = 18 × 40/9 × 40 = 720/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
90/40 = 90 × 9/40 × 9 = 810/360 - Subtract the two like fractions:
720/360 - 810/360 = 720 - 810/360 = -90/360 - After reducing the fraction, the answer is -1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/9-90/40 18/9-90/80 54/9-90/40 18/27-90/40 90/9-90/40 18/45-90/40 18/63-90/40