Subtract 25/10 from 42/81
1st number: 42/81, 2nd number: 2 5/10
42/81 - 25/10 is -107/54.
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,
42/81 = 42 × 10/81 × 10 = 420/810 - Likewise, for the 2nd fraction, since 10 × 81 = 810,
25/10 = 25 × 81/10 × 81 = 2025/810 - Subtract the two like fractions:
420/810 - 2025/810 = 420 - 2025/810 = -1605/810 - After reducing the fraction, the answer is -107/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/81-25/10 42/81-50/10 42/81-25/20 42/81-75/10 42/81-25/30 42/81-25/50 42/81-25/70