Subtract 20/21 from 90/14
1st number: 6 6/14, 2nd number: 20/21
90/14 - 20/21 is 115/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 14 × 3 = 42,
90/14 = 90 × 3/14 × 3 = 270/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
20/21 = 20 × 2/21 × 2 = 40/42 - Subtract the two like fractions:
270/42 - 40/42 = 270 - 40/42 = 230/42 - After reducing the fraction, the answer is 115/21
- In mixed form: 510/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/14-40/21 90/28-20/21 90/14-20/42 90/14-60/21 90/42-20/21 90/14-20/63 90/70-20/21 90/98-20/21