Subtract 3/90 from 42/12
1st number: 3 6/12, 2nd number: 3/90
42/12 - 3/90 is 52/15.
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,
3/90 = 3 × 2/90 × 2 = 6/180 - Subtract the two like fractions:
630/180 - 6/180 = 630 - 6/180 = 624/180 - After reducing the fraction, the answer is 52/15
- In mixed form: 37/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12-3/90 42/12-6/90 42/24-3/90 42/12-9/90 42/36-3/90 42/12-15/90 42/60-3/90 42/12-21/90 42/84-3/90