Subtract 54/21 from 90/2
1st number: 45 0/2, 2nd number: 2 12/21
90/2 - 54/21 is 297/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
90/2 = 90 × 21/2 × 21 = 1890/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
54/21 = 54 × 2/21 × 2 = 108/42 - Subtract the two like fractions:
1890/42 - 108/42 = 1890 - 108/42 = 1782/42 - After reducing the fraction, the answer is 297/7
- In mixed form: 423/7
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 90/2-54/42 90/6-54/21 90/2-54/63 90/10-54/21 90/14-54/21