Subtract 1/81 from 15/2
1st number: 7 1/2, 2nd number: 1/81
15/2 - 1/81 is 1213/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 2 × 81 = 162,
15/2 = 15 × 81/2 × 81 = 1215/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
1/81 = 1 × 2/81 × 2 = 2/162 - Subtract the two like fractions:
1215/162 - 2/162 = 1215 - 2/162 = 1213/162 - In mixed form: 779/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/2-1/81 15/2-2/81 15/4-1/81 45/2-1/81 15/2-3/81 15/6-1/81 75/2-1/81 15/2-5/81 15/10-1/81 15/2-7/81 15/14-1/81