Subtract 90/18 from 12/30
1st number: 12/30, 2nd number: 5 0/18
12/30 - 90/18 is -23/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
12/30 = 12 × 3/30 × 3 = 36/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
90/18 = 90 × 5/18 × 5 = 450/90 - Subtract the two like fractions:
36/90 - 450/90 = 36 - 450/90 = -414/90 - After reducing the fraction, the answer is -23/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/30-90/18 12/60-90/18 12/30-90/36 36/30-90/18 12/90-90/18 12/30-90/54 60/30-90/18 84/30-90/18