We divide 41009459 by 81
The aim is to understand the frequency of 81 in 41009459.

Advancing to step 1:
When dividing 4 by 81, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Include the next digit (1) from the dividend after 4, then repeat: 41 / 81

Let's proceed to step 2:
If we divide 41 by 81, we get 0 and a remainder of 41.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 41 to get 41.
Fetch the next digit (0) from the dividend, attach it to 41 and continue: 410 / 81

Moving on to step 3:
81 can be fit into 410 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we take 405 away from 410, we end up with 5.
Fetch the next digit (0) from the dividend, attach it to 5 and continue: 50 / 81

On to step 4:
When dividing 50 by 81, we get 0 with a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 50.0
The remainder is 50 after subtracting 0 from 50.
Take the next digit (9) from the dividend and append it to 50, then repeat: 509 / 81

On to step 5:
The number 81 fits into 509 6 times, leaving a remainder of 23.
The next digit of our result is 6. 
Result so far: 506.0
Subtract 486 from 509 to get 23.
Fetch the next digit (4) from the dividend, attach it to 23 and continue: 234 / 81

Going ahead to step 6:
234 divided by 81 is 2 with a remainder of 72.
Write down 2 as next digit of the result. 
Result so far: 5062.0
Subtracting 162 from 234 leaves us with 72.
Fetch the next digit (5) from the dividend, attach it to 72 and continue: 725 / 81

On to step 7:
When dividing 725 by 81, we get 8 with a remainder of 77.
Record the quotient 8 as the next digit in the result. 
Result so far: 50628.0
If we subtract 648 from 725, we get 77.
Grab the next digit (9) from the dividend, add it to 77, then carry on: 779 / 81

On to step 8:
The number 81 fits into 779 9 times, leaving a remainder of 50.
Put 9 as the next digit of the answer. 
Result so far: 506289.0
If we subtract 729 from 779, we 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.

Advancing to step 9:
If we divide 500 by 81, we get 6 and a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 506289.6
If we take 486 away from 500, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 10:
If we divide 140 by 81, we get 1 and a remainder of 59.
The number 1 becomes the next digit in our result. 
Result so far: 506289.61
If we take 81 away from 140, we end up with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Step 11:
The number 81 fits into 590 7 times, leaving a remainder of 23.
Write down 7 as next digit of the result. 
Result so far: 506289.617
If we take 567 away from 590, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 12:
The number 81 fits into 230 2 times, leaving a remainder of 68.
Record the quotient 2 as the next digit in the result. 
Result so far: 506289.6172
If we take 162 away from 230, we end up with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 13:
If we divide 680 by 81, we get 8 and a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 506289.61728
Deduct 648 from 680 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 14:
320 divided by 81 is 3 with a remainder of 77.
Use 3 as the next digit of our solution. 
Result so far: 506289.617283
If we subtract 243 from 320, we get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Let's proceed to step 15:
81 goes into 770 9 times with a remainder of 41.
Record the quotient 9 as the next digit in the result. 
Result so far: 506289.6172839
Subtract 729 from 770 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 16:
If we divide 410 by 81, we get 5 and a remainder of 5.
The next digit of our result is 5. 
Result so far: 506289.61728395
If we take 405 away from 410, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The quotient of the division is 506289.61728395, and the remainder is 5e-09.