Subtract 90/9 from 45/12
1st number: 3 9/12, 2nd number: 10 0/9
45/12 - 90/9 is -25/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 9 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
45/12 = 45 × 3/12 × 3 = 135/36 - Likewise, for the 2nd fraction, since 9 × 4 = 36,
90/9 = 90 × 4/9 × 4 = 360/36 - Subtract the two like fractions:
135/36 - 360/36 = 135 - 360/36 = -225/36 - After reducing the fraction, the answer is -25/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-90/9 45/24-90/9 45/12-90/18 45/36-90/9 45/12-90/27 45/60-90/9 45/12-90/45 45/84-90/9 45/12-90/63