Subtract 21/36 from 90/12
1st number: 7 6/12, 2nd number: 21/36
90/12 - 21/36 is 83/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 36 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
90/12 = 90 × 3/12 × 3 = 270/36 - Likewise, for the 2nd fraction, since 36 × 1 = 36,
21/36 = 21 × 1/36 × 1 = 21/36 - Subtract the two like fractions:
270/36 - 21/36 = 270 - 21/36 = 249/36 - After reducing the fraction, the answer is 83/12
- In mixed form: 611/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-42/36 90/24-21/36 90/12-21/72 90/12-63/36 90/36-21/36 90/60-21/36 90/84-21/36