Subtract 7/21 from 7/4
1st number: 1 3/4, 2nd number: 7/21
74 - 721 is 1712.
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,
74 = 7 × 214 × 21 = 14784 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
721 = 7 × 421 × 4 = 2884 - Subtract the two like fractions:
14784 - 2884 = 147 - 2884 = 11984 - After reducing the fraction, the answer is 1712
- In mixed form: 1512
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/4-7/21 7/4-14/21 7/8-7/21 7/4-7/42 21/4-7/21 7/12-7/21 7/4-7/63 35/4-7/21 7/4-35/21 7/20-7/21 49/4-7/21 7/4-49/21 7/28-7/21