Subtract 9/18 from 42/30
1st number: 1 12/30, 2nd number: 9/18
42/30 - 9/18 is 9/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
42/30 = 42 × 3/30 × 3 = 126/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
9/18 = 9 × 5/18 × 5 = 45/90 - Subtract the two like fractions:
126/90 - 45/90 = 126 - 45/90 = 81/90 - After reducing the fraction, the answer is 9/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/30-9/18 42/60-9/18 42/30-9/36 42/30-27/18 42/90-9/18 42/30-9/54 42/30-45/18 42/30-9/90 42/30-63/18