Subtract 20/84 from 90/12
1st number: 7 6/12, 2nd number: 20/84
90/12 - 20/84 is 305/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
90/12 = 90 × 7/12 × 7 = 630/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
20/84 = 20 × 1/84 × 1 = 20/84 - Subtract the two like fractions:
630/84 - 20/84 = 630 - 20/84 = 610/84 - After reducing the fraction, the answer is 305/42
- In mixed form: 711/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-40/84 90/24-20/84 90/12-60/84 90/36-20/84 90/60-20/84 90/84-20/84