Subtract 42/90 from 42/12
1st number: 3 6/12, 2nd number: 42/90
42/12 - 42/90 is 91/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
42/12 = 42 × 15/12 × 15 = 630/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
42/90 = 42 × 2/90 × 2 = 84/180 - Subtract the two like fractions:
630/180 - 84/180 = 630 - 84/180 = 546/180 - After reducing the fraction, the answer is 91/30
- In mixed form: 31/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12-42/90 42/12-84/90 42/24-42/90 42/36-42/90 42/60-42/90 42/84-42/90