Subtract 7/18 from 81/2
1st number: 40 1/2, 2nd number: 7/18
81/2 - 7/18 is 361/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 2 × 9 = 18,
81/2 = 81 × 9/2 × 9 = 729/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
7/18 = 7 × 1/18 × 1 = 7/18 - Subtract the two like fractions:
729/18 - 7/18 = 729 - 7/18 = 722/18 - After reducing the fraction, the answer is 361/9
- In mixed form: 401/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/2-14/18 81/4-7/18 81/2-7/36 81/2-21/18 81/6-7/18 81/2-7/54 81/2-35/18 81/10-7/18 81/2-7/90 81/2-49/18 81/14-7/18