Subtract 12/90 from 45/30
1st number: 1 15/30, 2nd number: 12/90
45/30 - 12/90 is 41/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
45/30 = 45 × 3/30 × 3 = 135/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
12/90 = 12 × 1/90 × 1 = 12/90 - Subtract the two like fractions:
135/90 - 12/90 = 135 - 12/90 = 123/90 - After reducing the fraction, the answer is 41/30
- In mixed form: 111/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30-12/90 45/30-24/90 45/60-12/90 45/30-36/90 45/90-12/90 45/30-60/90 45/30-84/90