Subtract 54/21 from 45/4
1st number: 11 1/4, 2nd number: 2 12/21
45/4 - 54/21 is 243/28.
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,
45/4 = 45 × 21/4 × 21 = 945/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
54/21 = 54 × 4/21 × 4 = 216/84 - Subtract the two like fractions:
945/84 - 216/84 = 945 - 216/84 = 729/84 - After reducing the fraction, the answer is 243/28
- In mixed form: 819/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/4-54/21 45/8-54/21 45/4-54/42 45/12-54/21 45/4-54/63 45/20-54/21 45/28-54/21