Subtract 7/21 from 9/4
1st number: 2 1/4, 2nd number: 7/21
9/4 - 7/21 is 23/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
9/4 = 9 × 21/4 × 21 = 189/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
7/21 = 7 × 4/21 × 4 = 28/84 - Subtract the two like fractions:
189/84 - 28/84 = 189 - 28/84 = 161/84 - After reducing the fraction, the answer is 23/12
- In mixed form: 111/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/4-7/21 9/4-14/21 9/8-7/21 9/4-7/42 27/4-7/21 9/12-7/21 9/4-7/63 45/4-7/21 9/4-35/21 9/20-7/21 63/4-7/21 9/4-49/21 9/28-7/21