Subtract 3/21 from 7/4
1st number: 1 3/4, 2nd number: 3/21
7/4 - 3/21 is 45/28.
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,
7/4 = 7 × 21/4 × 21 = 147/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
3/21 = 3 × 4/21 × 4 = 12/84 - Subtract the two like fractions:
147/84 - 12/84 = 147 - 12/84 = 135/84 - After reducing the fraction, the answer is 45/28
- In mixed form: 117/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/4-3/21 7/4-6/21 7/8-3/21 7/4-3/42 21/4-3/21 7/4-9/21 7/12-3/21 7/4-3/63 35/4-3/21 7/4-15/21 7/20-3/21 49/4-3/21 7/28-3/21