Subtract 40/21 from 80/12
1st number: 6 8/12, 2nd number: 1 19/21
80/12 - 40/21 is 100/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
80/12 = 80 × 7/12 × 7 = 560/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
40/21 = 40 × 4/21 × 4 = 160/84 - Subtract the two like fractions:
560/84 - 160/84 = 560 - 160/84 = 400/84 - After reducing the fraction, the answer is 100/21
- In mixed form: 416/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/12-80/21 80/24-40/21 80/12-40/42 80/36-40/21 80/12-40/63 80/60-40/21 80/84-40/21