Subtract 30/12 from 40/90
1st number: 40/90, 2nd number: 2 6/12
40/90 - 30/12 is -37/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
40/90 = 40 × 2/90 × 2 = 80/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
30/12 = 30 × 15/12 × 15 = 450/180 - Subtract the two like fractions:
80/180 - 450/180 = 80 - 450/180 = -370/180 - After reducing the fraction, the answer is -37/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90-30/12 40/90-60/12 40/90-30/24 40/90-90/12 40/90-30/36 40/90-30/60 40/90-30/84