Subtract 10/42 from 40/12
1st number: 3 4/12, 2nd number: 10/42
40/12 - 10/42 is 65/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
40/12 = 40 × 7/12 × 7 = 280/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
10/42 = 10 × 2/42 × 2 = 20/84 - Subtract the two like fractions:
280/84 - 20/84 = 280 - 20/84 = 260/84 - After reducing the fraction, the answer is 65/21
- In mixed form: 32/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/12-10/42 40/12-20/42 40/24-10/42 40/12-10/84 40/12-30/42 40/36-10/42 40/12-50/42 40/60-10/42 40/12-70/42 40/84-10/42