Subtract 30/18 from 42/10
1st number: 4 2/10, 2nd number: 1 12/18
42/10 - 30/18 is 38/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 18 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 18 × 5 = 90,
30/18 = 30 × 5/18 × 5 = 150/90 - Subtract the two like fractions:
378/90 - 150/90 = 378 - 150/90 = 228/90 - After reducing the fraction, the answer is 38/15
- In mixed form: 28/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/10-30/18 42/10-60/18 42/20-30/18 42/10-30/36 42/10-90/18 42/30-30/18 42/10-30/54 42/50-30/18 42/10-30/90 42/70-30/18