Subtract 9/90 from 21/3
1st number: 7 0/3, 2nd number: 9/90
21/3 - 9/90 is 69/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 3 × 30 = 90,
21/3 = 21 × 30/3 × 30 = 630/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
9/90 = 9 × 1/90 × 1 = 9/90 - Subtract the two like fractions:
630/90 - 9/90 = 630 - 9/90 = 621/90 - After reducing the fraction, the answer is 69/10
- In mixed form: 69/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3-9/90 21/3-18/90 21/6-9/90 63/3-9/90 21/3-27/90 21/9-9/90 21/3-45/90 21/15-9/90 21/3-63/90