Subtract 45/21 from 28/4
1st number: 7 0/4, 2nd number: 2 3/21
28/4 - 45/21 is 34/7.
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,
28/4 = 28 × 21/4 × 21 = 588/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
45/21 = 45 × 4/21 × 4 = 180/84 - Subtract the two like fractions:
588/84 - 180/84 = 588 - 180/84 = 408/84 - After reducing the fraction, the answer is 34/7
- In mixed form: 46/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/4-45/21 28/4-90/21 28/8-45/21 28/4-45/42 84/4-45/21 28/12-45/21 28/4-45/63 28/20-45/21