Subtract 84/9 from 63/21
1st number: 3 0/21, 2nd number: 9 3/9
63/21 - 84/9 is -19/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
63/21 = 63 × 3/21 × 3 = 189/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
84/9 = 84 × 7/9 × 7 = 588/63 - Subtract the two like fractions:
189/63 - 588/63 = 189 - 588/63 = -399/63 - After reducing the fraction, the answer is -19/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/42-84/9 63/21-84/18 63/21-84/27 63/21-84/45 63/21-84/63