Subtract 18/10 from 7/81
1st number: 7/81, 2nd number: 1 8/10
7/81 - 18/10 is -694/405.
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,
7/81 = 7 × 10/81 × 10 = 70/810 - Likewise, for the 2nd fraction, since 10 × 81 = 810,
18/10 = 18 × 81/10 × 81 = 1458/810 - Subtract the two like fractions:
70/810 - 1458/810 = 70 - 1458/810 = -1388/810 - After reducing the fraction, the answer is -694/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/81-18/10 7/81-36/10 7/81-18/20 21/81-18/10 7/81-54/10 7/81-18/30 35/81-18/10 7/81-90/10 7/81-18/50 49/81-18/10 7/81-18/70