Subtract 90/40 from 18/12
1st number: 1 6/12, 2nd number: 2 10/40
18/12 - 90/40 is -3/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 12 × 10 = 120,
18/12 = 18 × 10/12 × 10 = 180/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
90/40 = 90 × 3/40 × 3 = 270/120 - Subtract the two like fractions:
180/120 - 270/120 = 180 - 270/120 = -90/120 - After reducing the fraction, the answer is -3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12-90/40 18/24-90/40 18/12-90/80 54/12-90/40 18/36-90/40 90/12-90/40 18/60-90/40 18/84-90/40