Subtract 18/90 from 42/10
1st number: 4 2/10, 2nd number: 18/90
42/10 - 18/90 is 4/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 10 × 9 = 90,
42/10 = 42 × 9/10 × 9 = 378/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
18/90 = 18 × 1/90 × 1 = 18/90 - Subtract the two like fractions:
378/90 - 18/90 = 378 - 18/90 = 360/90 - After reducing the fraction, the answer is 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/10-18/90 42/10-36/90 42/20-18/90 42/10-54/90 42/30-18/90 42/50-18/90 42/70-18/90