Subtract 45/18 from 21/3
1st number: 7 0/3, 2nd number: 2 9/18
21/3 - 45/18 is 9/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 3 × 6 = 18,
21/3 = 21 × 6/3 × 6 = 126/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
45/18 = 45 × 1/18 × 1 = 45/18 - Subtract the two like fractions:
126/18 - 45/18 = 126 - 45/18 = 81/18 - After reducing the fraction, the answer is 9/2
- In mixed form: 41/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3-45/18 21/3-90/18 21/6-45/18 21/3-45/36 63/3-45/18 21/9-45/18 21/3-45/54 21/15-45/18 21/3-45/90