Subtract 90/36 from 18/9
1st number: 2 0/9, 2nd number: 2 18/36
18/9 - 90/36 is -1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 36 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 9 × 4 = 36,
18/9 = 18 × 4/9 × 4 = 72/36 - Likewise, for the 2nd fraction, since 36 × 1 = 36,
90/36 = 90 × 1/36 × 1 = 90/36 - Subtract the two like fractions:
72/36 - 90/36 = 72 - 90/36 = -18/36 - After reducing the fraction, the answer is -1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/9-90/36 18/9-90/72 54/9-90/36 18/27-90/36 90/9-90/36 18/45-90/36 18/63-90/36