Subtract 81/36 from 21/10
1st number: 2 1/10, 2nd number: 2 9/36
21/10 - 81/36 is -3/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 36 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 10 × 18 = 180,
21/10 = 21 × 18/10 × 18 = 378/180 - Likewise, for the 2nd fraction, since 36 × 5 = 180,
81/36 = 81 × 5/36 × 5 = 405/180 - Subtract the two like fractions:
378/180 - 405/180 = 378 - 405/180 = -27/180 - After reducing the fraction, the answer is -3/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/10-81/36 21/20-81/36 21/10-81/72 63/10-81/36 21/30-81/36 21/50-81/36 21/70-81/36