Subtract 90/18 from 42/8
1st number: 5 2/8, 2nd number: 5 0/18
42/8 - 90/18 is 1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 18 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
42/8 = 42 × 9/8 × 9 = 378/72 - Likewise, for the 2nd fraction, since 18 × 4 = 72,
90/18 = 90 × 4/18 × 4 = 360/72 - Subtract the two like fractions:
378/72 - 360/72 = 378 - 360/72 = 18/72 - After reducing the fraction, the answer is 1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8-90/18 42/16-90/18 42/8-90/36 42/24-90/18 42/8-90/54 42/40-90/18 42/56-90/18