Subtract 18/8 from 90/12
1st number: 7 6/12, 2nd number: 2 2/8
90/12 - 18/8 is 21/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 8 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 12 × 2 = 24,
90/12 = 90 × 2/12 × 2 = 180/24 - Likewise, for the 2nd fraction, since 8 × 3 = 24,
18/8 = 18 × 3/8 × 3 = 54/24 - Subtract the two like fractions:
180/24 - 54/24 = 180 - 54/24 = 126/24 - After reducing the fraction, the answer is 21/4
- In mixed form: 51/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-36/8 90/24-18/8 90/12-18/16 90/12-54/8 90/36-18/8 90/12-18/24 90/12-90/8 90/60-18/8 90/12-18/40 90/84-18/8 90/12-18/56