69399104 ÷ 810 
The aim is to understand the frequency of 810 in 69399104.

Step 1:
6 divided by 810 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 810

Step 2:
The number 810 fits into 69 0 times, leaving a remainder of 69.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 69, we end up with 69.
Bring next digit (3) of the dividend behind the 69 and repeat the process: 693 / 810

Going ahead to step 3:
810 can be fit into 693 0 times, resulting in a remainder of 693.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 693 to get 693.
Include the next digit (9) from the dividend after 693, then repeat: 6939 / 810

Going ahead to step 4:
When dividing 6939 by 810, we get 8 with a remainder of 459.
Use 8 as the next digit of our solution. 
Result so far: 8.0
The remainder is 459 after subtracting 6480 from 6939.
Grab the next digit (9) from the dividend, add it to 459, then carry on: 4599 / 810

Advancing to step 5:
The number 810 fits into 4599 5 times, leaving a remainder of 549.
The number 5 becomes the next digit in our result. 
Result so far: 85.0
Subtracting 4050 from 4599 leaves us with 549.
Fetch the next digit (1) from the dividend, attach it to 549 and continue: 5491 / 810

Let's proceed to step 6:
810 can be fit into 5491 6 times, resulting in a remainder of 631.
Write down 6 as next digit of the result. 
Result so far: 856.0
Subtracting 4860 from 5491 leaves us with 631.
Include the next digit (0) from the dividend after 631, then repeat: 6310 / 810

On to step 7:
If we divide 6310 by 810, we get 7 and a remainder of 640.
The number 7 becomes the next digit in our result. 
Result so far: 8567.0
Deduct 5670 from 6310 and we're left with 640.
Include the next digit (4) from the dividend after 640, then repeat: 6404 / 810

On to step 8:
810 can be fit into 6404 7 times, resulting in a remainder of 734.
Record the quotient 7 as the next digit in the result. 
Result so far: 85677.0
Subtract 5670 from 6404 to get 734.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7340, and continue the process.

Advancing to step 9:
If we divide 7340 by 810, we get 9 and a remainder of 50.
The number 9 becomes the next digit in our result. 
Result so far: 85677.9
If we take 7290 away from 7340, we end up 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.

Moving on to step 10:
810 can be fit into 500 0 times, resulting in a remainder of 500.
Use 0 as the next digit of our solution. 
Result so far: 85677.9
Subtracting 0 from 500 leaves us with 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Going ahead to step 11:
The number 810 fits into 5000 6 times, leaving a remainder of 140.
Use 6 as the next digit of our solution. 
Result so far: 85677.906
Deduct 4860 from 5000 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

On to step 12:
810 goes into 1400 1 times with a remainder of 590.
The number 1 becomes the next digit in our result. 
Result so far: 85677.9061
Subtracting 810 from 1400 leaves us with 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5900, and continue the process.

On to step 13:
When dividing 5900 by 810, we get 7 with a remainder of 230.
Put 7 as the next digit of the answer. 
Result so far: 85677.90617
If we take 5670 away from 5900, we end up with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Let's proceed to step 14:
2300 divided by 810 is 2 with a remainder of 680.
The number 2 becomes the next digit in our result. 
Result so far: 85677.906172
Subtracting 1620 from 2300 leaves us with 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Moving on to step 15:
810 goes into 6800 8 times with a remainder of 320.
The number 8 becomes the next digit in our result. 
Result so far: 85677.9061728
If we take 6480 away from 6800, we end up with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Moving on to step 16:
The number 810 fits into 3200 3 times, leaving a remainder of 770.
Use 3 as the next digit of our solution. 
Result so far: 85677.90617283
Subtracting 2430 from 3200 leaves us with 770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7700, and continue the process.

After the division, we end up with 85677.90617283 and a remainder of 7.7e-07.