Subtract 12/36 from 40/21
1st number: 1 19/21, 2nd number: 12/36
40/21 - 12/36 is 11/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 21 × 12 = 252,
40/21 = 40 × 12/21 × 12 = 480/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
12/36 = 12 × 7/36 × 7 = 84/252 - Subtract the two like fractions:
480/252 - 84/252 = 480 - 84/252 = 396/252 - After reducing the fraction, the answer is 11/7
- In mixed form: 14/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-12/36 40/21-24/36 40/42-12/36 40/21-12/72 40/63-12/36 40/21-60/36 40/21-84/36