Subtract 21/81 from 50/30
1st number: 1 20/30, 2nd number: 21/81
50/30 - 21/81 is 38/27.
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,
50/30 = 50 × 27/30 × 27 = 1350/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
21/81 = 21 × 10/81 × 10 = 210/810 - Subtract the two like fractions:
1350/810 - 210/810 = 1350 - 210/810 = 1140/810 - After reducing the fraction, the answer is 38/27
- In mixed form: 111/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/30-42/81 50/60-21/81 50/30-63/81 50/90-21/81