We look at the division of 81639191 by 105 
The aim is to understand the frequency of 105 in 81639191.

Step 1:
If we divide 8 by 105, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 105

Moving on to step 2:
When dividing 81 by 105, we get 0 with a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Grab the next digit (6) from the dividend, add it to 81, then carry on: 816 / 105

On to step 3:
105 goes into 816 7 times with a remainder of 81.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 81 after subtracting 735 from 816.
Append the next digit (3) from the dividend to 81 and continue with: 813 / 105

Going ahead to step 4:
If we divide 813 by 105, we get 7 and a remainder of 78.
Record the quotient 7 as the next digit in the result. 
Result so far: 77.0
If we take 735 away from 813, we end up with 78.
Include the next digit (9) from the dividend after 78, then repeat: 789 / 105

Going ahead to step 5:
The number 105 fits into 789 7 times, leaving a remainder of 54.
The number 7 becomes the next digit in our result. 
Result so far: 777.0
The remainder is 54 after subtracting 735 from 789.
Fetch the next digit (1) from the dividend, attach it to 54 and continue: 541 / 105

Moving on to step 6:
105 goes into 541 5 times with a remainder of 16.
Record the quotient 5 as the next digit in the result. 
Result so far: 7775.0
If we subtract 525 from 541, we get 16.
Grab the next digit (9) from the dividend, add it to 16, then carry on: 169 / 105

Going ahead to step 7:
When dividing 169 by 105, we get 1 with a remainder of 64.
Use 1 as the next digit of our solution. 
Result so far: 77751.0
If we subtract 105 from 169, we get 64.
Fetch the next digit (1) from the dividend, attach it to 64 and continue: 641 / 105

Moving on to step 8:
105 goes into 641 6 times with a remainder of 11.
The next digit of our result is 6. 
Result so far: 777516.0
If we take 630 away from 641, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 9:
105 can be fit into 110 1 times, resulting in a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 777516.1
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 10:
The number 105 fits into 50 0 times, leaving a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 777516.1
Subtract 0 from 50 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 11:
105 can be fit into 500 4 times, resulting in a remainder of 80.
Use 4 as the next digit of our solution. 
Result so far: 777516.104
If we subtract 420 from 500, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 12:
When dividing 800 by 105, we get 7 with a remainder of 65.
Record the quotient 7 as the next digit in the result. 
Result so far: 777516.1047
The remainder is 65 after subtracting 735 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Step 13:
The number 105 fits into 650 6 times, leaving a remainder of 20.
Put 6 as the next digit of the answer. 
Result so far: 777516.10476
Deduct 630 from 650 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 14:
The number 105 fits into 200 1 times, leaving a remainder of 95.
Record the quotient 1 as the next digit in the result. 
Result so far: 777516.104761
Deduct 105 from 200 and we're left with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Advancing to step 15:
When dividing 950 by 105, we get 9 with a remainder of 5.
Record the quotient 9 as the next digit in the result. 
Result so far: 777516.1047619
The remainder is 5 after subtracting 945 from 950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 16:
If we divide 50 by 105, we get 0 and a remainder of 50.
Use 0 as the next digit of our solution. 
Result so far: 777516.1047619
Deduct 0 from 50 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The final result is 777516.1047619 with a remainder of 5e-08.