Subtract 84/5 from 9/21
1st number: 9/21, 2nd number: 16 4/5
9/21 - 84/5 is -573/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
9/21 = 9 × 5/21 × 5 = 45/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
84/5 = 84 × 21/5 × 21 = 1764/105 - Subtract the two like fractions:
45/105 - 1764/105 = 45 - 1764/105 = -1719/105 - After reducing the fraction, the answer is -573/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-84/5 9/42-84/5 9/21-84/10 27/21-84/5 9/63-84/5 9/21-84/15 45/21-84/5 9/21-84/25 63/21-84/5 9/21-84/35