Answers

Subtract 18/10 from 15/81

1^st number: 15/81, 2^nd number: 1 8/10

15/81 - 18/10 is -218/135.

Steps for subtracting fractions

1. 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
2. For the 1st fraction, since 81 × 10 = 810,
   15/81 = 15 × 10/81 × 10 = 150/810
3. Likewise, for the 2nd fraction, since 10 × 81 = 810,
   18/10 = 18 × 81/10 × 81 = 1458/810
4. Subtract the two like fractions:
   150/810 - 1458/810 = 150 - 1458/810 = -1308/810
5. After reducing the fraction, the answer is -218/135

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