Subtract 90/80 from 18/2
1st number: 9 0/2, 2nd number: 1 10/80
18/2 - 90/80 is 63/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 2 × 40 = 80,
18/2 = 18 × 40/2 × 40 = 720/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
90/80 = 90 × 1/80 × 1 = 90/80 - Subtract the two like fractions:
720/80 - 90/80 = 720 - 90/80 = 630/80 - After reducing the fraction, the answer is 63/8
- In mixed form: 77/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/2-90/80 18/4-90/80 54/2-90/80 18/6-90/80 90/2-90/80 18/10-90/80 18/14-90/80