Subtract 3/90 from 84/21
1st number: 4 0/21, 2nd number: 3/90
84/21 - 3/90 is 119/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
84/21 = 84 × 30/21 × 30 = 2520/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
3/90 = 3 × 7/90 × 7 = 21/630 - Subtract the two like fractions:
2520/630 - 21/630 = 2520 - 21/630 = 2499/630 - After reducing the fraction, the answer is 119/30
- In mixed form: 329/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-6/90 84/42-3/90 84/21-9/90 84/63-3/90 84/21-15/90 84/21-21/90