Subtract 28/10 from 25/81
1st number: 25/81, 2nd number: 2 8/10
25/81 - 28/10 is -1009/405.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 10 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
25/81 = 25 × 10/81 × 10 = 250/810 - Likewise, for the 2nd fraction, since 10 × 81 = 810,
28/10 = 28 × 81/10 × 81 = 2268/810 - Subtract the two like fractions:
250/810 - 2268/810 = 250 - 2268/810 = -2018/810 - After reducing the fraction, the answer is -1009/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/81-28/10 25/81-56/10 25/81-28/20 75/81-28/10 25/81-84/10 25/81-28/30 25/81-28/50 25/81-28/70