Subtract 90/54 from 12/40
1st number: 12/40, 2nd number: 1 36/54
12/40 - 90/54 is -41/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 54 is 1080
Next, find the equivalent fraction of both fractional numbers with denominator 1080 - For the 1st fraction, since 40 × 27 = 1080,
12/40 = 12 × 27/40 × 27 = 324/1080 - Likewise, for the 2nd fraction, since 54 × 20 = 1080,
90/54 = 90 × 20/54 × 20 = 1800/1080 - Subtract the two like fractions:
324/1080 - 1800/1080 = 324 - 1800/1080 = -1476/1080 - After reducing the fraction, the answer is -41/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/40-90/54 12/80-90/54 36/40-90/54 60/40-90/54 84/40-90/54