36501513 ÷ 999 
The aim is to understand the frequency of 999 in 36501513.

Advancing to step 1:
The number 999 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (6) from the dividend and append it to 3, then repeat: 36 / 999

On to step 2:
If we divide 36 by 999, we get 0 and a remainder of 36.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 36 leaves us with 36.
Append the next digit (5) from the dividend to 36 and continue with: 365 / 999

Moving on to step 3:
The number 999 fits into 365 0 times, leaving a remainder of 365.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 365, we get 365.
Append the next digit (0) from the dividend to 365 and continue with: 3650 / 999

On to step 4:
The number 999 fits into 3650 3 times, leaving a remainder of 653.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 653 after subtracting 2997 from 3650.
Fetch the next digit (1) from the dividend, attach it to 653 and continue: 6531 / 999

Moving on to step 5:
If we divide 6531 by 999, we get 6 and a remainder of 537.
Record the quotient 6 as the next digit in the result. 
Result so far: 36.0
Subtract 5994 from 6531 to get 537.
Grab the next digit (5) from the dividend, add it to 537, then carry on: 5375 / 999

Step 6:
999 goes into 5375 5 times with a remainder of 380.
Use 5 as the next digit of our solution. 
Result so far: 365.0
Deduct 4995 from 5375 and we're left with 380.
Fetch the next digit (1) from the dividend, attach it to 380 and continue: 3801 / 999

Advancing to step 7:
3801 divided by 999 is 3 with a remainder of 804.
Write down 3 as next digit of the result. 
Result so far: 3653.0
Subtracting 2997 from 3801 leaves us with 804.
Include the next digit (3) from the dividend after 804, then repeat: 8043 / 999

On to step 8:
999 can be fit into 8043 8 times, resulting in a remainder of 51.
Use 8 as the next digit of our solution. 
Result so far: 36538.0
Subtracting 7992 from 8043 leaves us with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Let's proceed to step 9:
999 can be fit into 510 0 times, resulting in a remainder of 510.
Use 0 as the next digit of our solution. 
Result so far: 36538.0
Subtracting 0 from 510 leaves us with 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Moving on to step 10:
5100 divided by 999 is 5 with a remainder of 105.
Use 5 as the next digit of our solution. 
Result so far: 36538.05
Deduct 4995 from 5100 and we're left with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Advancing to step 11:
When dividing 1050 by 999, we get 1 with a remainder of 51.
The next digit of our result is 1. 
Result so far: 36538.051
Subtract 999 from 1050 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

On to step 12:
If we divide 510 by 999, we get 0 and a remainder of 510.
The next digit of our result is 0. 
Result so far: 36538.051
The remainder is 510 after subtracting 0 from 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Moving on to step 13:
The number 999 fits into 5100 5 times, leaving a remainder of 105.
Use 5 as the next digit of our solution. 
Result so far: 36538.05105
Subtracting 4995 from 5100 leaves us with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Advancing to step 14:
If we divide 1050 by 999, we get 1 and a remainder of 51.
Put 1 as the next digit of the answer. 
Result so far: 36538.051051
The remainder is 51 after subtracting 999 from 1050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Moving on to step 15:
999 goes into 510 0 times with a remainder of 510.
Use 0 as the next digit of our solution. 
Result so far: 36538.051051
If we take 0 away from 510, we end up with 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Going ahead to step 16:
999 goes into 5100 5 times with a remainder of 105.
Use 5 as the next digit of our solution. 
Result so far: 36538.05105105
Deduct 4995 from 5100 and we're left with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

The final outcome is 36538.05105105, with a leftover of 1.05e-07.