Subtract 12/18 from 40/21
1st number: 1 19/21, 2nd number: 12/18
40/21 - 12/18 is 26/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
40/21 = 40 × 6/21 × 6 = 240/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
12/18 = 12 × 7/18 × 7 = 84/126 - Subtract the two like fractions:
240/126 - 84/126 = 240 - 84/126 = 156/126 - After reducing the fraction, the answer is 26/21
- In mixed form: 15/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-12/18 40/21-24/18 40/42-12/18 40/21-12/36 40/21-36/18 40/63-12/18 40/21-12/54 40/21-60/18 40/21-12/90 40/21-84/18