Subtract 42/45 from 18/12
1st number: 1 6/12, 2nd number: 42/45
18/12 - 42/45 is 17/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
18/12 = 18 × 15/12 × 15 = 270/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
42/45 = 42 × 4/45 × 4 = 168/180 - Subtract the two like fractions:
270/180 - 168/180 = 270 - 168/180 = 102/180 - After reducing the fraction, the answer is 17/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12-42/45 18/12-84/45 18/24-42/45 18/12-42/90 54/12-42/45 18/36-42/45 90/12-42/45 18/60-42/45 18/84-42/45