Subtract 90/12 from 40/45
1st number: 40/45, 2nd number: 7 6/12
40/45 - 90/12 is -119/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
40/45 = 40 × 4/45 × 4 = 160/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
90/12 = 90 × 15/12 × 15 = 1350/180 - Subtract the two like fractions:
160/180 - 1350/180 = 160 - 1350/180 = -1190/180 - After reducing the fraction, the answer is -119/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/45-90/12 40/90-90/12 40/45-90/24 40/45-90/36 40/45-90/60 40/45-90/84