Subtract 42/18 from 15/30
1st number: 15/30, 2nd number: 2 6/18
15/30 - 42/18 is -11/6.
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,
15/30 = 15 × 3/30 × 3 = 45/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
42/18 = 42 × 5/18 × 5 = 210/90 - Subtract the two like fractions:
45/90 - 210/90 = 45 - 210/90 = -165/90 - After reducing the fraction, the answer is -11/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 15/30-84/18 15/60-42/18 15/30-42/36 45/30-42/18 15/90-42/18 15/30-42/54 75/30-42/18 15/30-42/90