Subtract 15/21 from 1/36
1/36 - 15/21 is -173/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
1/36 = 1 × 7/36 × 7 = 7/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
15/21 = 15 × 12/21 × 12 = 180/252 - Subtract the two like fractions:
7/252 - 180/252 = 7 - 180/252 = -173/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/36-15/21 1/36-30/21 1/72-15/21 1/36-15/42 3/36-15/21 1/36-45/21 1/36-15/63 5/36-15/21 1/36-75/21 7/36-15/21