Subtract 90/21 from 45/2
1st number: 22 1/2, 2nd number: 4 6/21
45/2 - 90/21 is 255/14.
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,
45/2 = 45 × 21/2 × 21 = 945/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
90/21 = 90 × 2/21 × 2 = 180/42 - Subtract the two like fractions:
945/42 - 180/42 = 945 - 180/42 = 765/42 - After reducing the fraction, the answer is 255/14
- In mixed form: 183/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/2-90/21 45/4-90/21 45/2-90/42 45/6-90/21 45/2-90/63 45/10-90/21 45/14-90/21