Subtract 9/15 from 81/2
1st number: 40 1/2, 2nd number: 9/15
81/2 - 9/15 is 399/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 2 × 15 = 30,
81/2 = 81 × 15/2 × 15 = 1215/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
9/15 = 9 × 2/15 × 2 = 18/30 - Subtract the two like fractions:
1215/30 - 18/30 = 1215 - 18/30 = 1197/30 - After reducing the fraction, the answer is 399/10
- In mixed form: 399/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/2-18/15 81/4-9/15 81/2-9/30 81/2-27/15 81/6-9/15 81/2-9/45 81/2-45/15 81/10-9/15 81/2-9/75 81/2-63/15 81/14-9/15