Subtract 9/7 from 84/21
1st number: 4 0/21, 2nd number: 1 2/7
84/21 - 9/7 is 19/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
84/21 = 84 × 1/21 × 1 = 84/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
9/7 = 9 × 3/7 × 3 = 27/21 - Subtract the two like fractions:
84/21 - 27/21 = 84 - 27/21 = 57/21 - After reducing the fraction, the answer is 19/7
- In mixed form: 25/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-18/7 84/42-9/7 84/21-9/14 84/21-27/7 84/63-9/7 84/21-9/21 84/21-45/7 84/21-9/35 84/21-63/7 84/21-9/49