Subtract 12/81 from 40/30
1st number: 1 10/30, 2nd number: 12/81
40/30 - 12/81 is 32/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 30 × 27 = 810,
40/30 = 40 × 27/30 × 27 = 1080/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
12/81 = 12 × 10/81 × 10 = 120/810 - Subtract the two like fractions:
1080/810 - 120/810 = 1080 - 120/810 = 960/810 - After reducing the fraction, the answer is 32/27
- In mixed form: 15/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/30-12/81 40/30-24/81 40/60-12/81 40/30-36/81 40/90-12/81 40/30-60/81 40/30-84/81