Subtract 42/18 from 30/75
1st number: 30/75, 2nd number: 2 6/18
30/75 - 42/18 is -29/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 18 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 75 × 6 = 450,
30/75 = 30 × 6/75 × 6 = 180/450 - Likewise, for the 2nd fraction, since 18 × 25 = 450,
42/18 = 42 × 25/18 × 25 = 1050/450 - Subtract the two like fractions:
180/450 - 1050/450 = 180 - 1050/450 = -870/450 - After reducing the fraction, the answer is -29/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/75-42/18 30/75-84/18 30/75-42/36 90/75-42/18 30/75-42/54 30/75-42/90