Subtract 90/48 from 18/12
1st number: 1 6/12, 2nd number: 1 42/48
18/12 - 90/48 is -3/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 48 is 48
Next, find the equivalent fraction of both fractional numbers with denominator 48 - For the 1st fraction, since 12 × 4 = 48,
18/12 = 18 × 4/12 × 4 = 72/48 - Likewise, for the 2nd fraction, since 48 × 1 = 48,
90/48 = 90 × 1/48 × 1 = 90/48 - Subtract the two like fractions:
72/48 - 90/48 = 72 - 90/48 = -18/48 - After reducing the fraction, the answer is -3/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12-90/48 18/24-90/48 18/12-90/96 54/12-90/48 18/36-90/48 90/12-90/48 18/60-90/48 18/84-90/48