Subtract 7/90 from 42/15
1st number: 2 12/15, 2nd number: 7/90
42/15 - 7/90 is 49/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
42/15 = 42 × 6/15 × 6 = 252/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
7/90 = 7 × 1/90 × 1 = 7/90 - Subtract the two like fractions:
252/90 - 7/90 = 252 - 7/90 = 245/90 - After reducing the fraction, the answer is 49/18
- In mixed form: 213/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/15-7/90 42/15-14/90 42/30-7/90 42/15-21/90 42/45-7/90 42/15-35/90 42/75-7/90 42/15-49/90