We're dividing 8032564 by 645 
The aim is to understand the frequency of 645 in 8032564.

Let's proceed to step 1:
If we divide 8 by 645, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 645

Step 2:
80 divided by 645 is 0 with a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 80, we end up with 80.
Grab the next digit (3) from the dividend, add it to 80, then carry on: 803 / 645

On to step 3:
803 divided by 645 is 1 with a remainder of 158.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 645 from 803 leaves us with 158.
Fetch the next digit (2) from the dividend, attach it to 158 and continue: 1582 / 645

Advancing to step 4:
When dividing 1582 by 645, we get 2 with a remainder of 292.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 1290 from 1582 and we're left with 292.
Grab the next digit (5) from the dividend, add it to 292, then carry on: 2925 / 645

Moving on to step 5:
645 can be fit into 2925 4 times, resulting in a remainder of 345.
Write down 4 as next digit of the result. 
Result so far: 124.0
Subtracting 2580 from 2925 leaves us with 345.
Grab the next digit (6) from the dividend, add it to 345, then carry on: 3456 / 645

Let's proceed to step 6:
645 goes into 3456 5 times with a remainder of 231.
Use 5 as the next digit of our solution. 
Result so far: 1245.0
If we subtract 3225 from 3456, we get 231.
Grab the next digit (4) from the dividend, add it to 231, then carry on: 2314 / 645

On to step 7:
The number 645 fits into 2314 3 times, leaving a remainder of 379.
Record the quotient 3 as the next digit in the result. 
Result so far: 12453.0
If we take 1935 away from 2314, we end up with 379.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3790, and continue the process.

Moving on to step 8:
645 can be fit into 3790 5 times, resulting in a remainder of 565.
The next digit of our result is 5. 
Result so far: 12453.5
If we subtract 3225 from 3790, we get 565.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5650, and continue the process.

Step 9:
645 goes into 5650 8 times with a remainder of 490.
Put 8 as the next digit of the answer. 
Result so far: 12453.58
Subtracting 5160 from 5650 leaves us with 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Going ahead to step 10:
The number 645 fits into 4900 7 times, leaving a remainder of 385.
Put 7 as the next digit of the answer. 
Result so far: 12453.587
Deduct 4515 from 4900 and we're left with 385.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3850, and continue the process.

Advancing to step 11:
When dividing 3850 by 645, we get 5 with a remainder of 625.
Record the quotient 5 as the next digit in the result. 
Result so far: 12453.5875
If we take 3225 away from 3850, we end up with 625.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6250, and continue the process.

Moving on to step 12:
645 goes into 6250 9 times with a remainder of 445.
Put 9 as the next digit of the answer. 
Result so far: 12453.58759
If we subtract 5805 from 6250, we get 445.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4450, and continue the process.

Advancing to step 13:
If we divide 4450 by 645, we get 6 and a remainder of 580.
Put 6 as the next digit of the answer. 
Result so far: 12453.587596
If we take 3870 away from 4450, we end up with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Step 14:
645 can be fit into 5800 8 times, resulting in a remainder of 640.
Write down 8 as next digit of the result. 
Result so far: 12453.5875968
Subtract 5160 from 5800 to get 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Going ahead to step 15:
645 goes into 6400 9 times with a remainder of 595.
Put 9 as the next digit of the answer. 
Result so far: 12453.58759689
Deduct 5805 from 6400 and we're left with 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

After the division, we end up with 12453.58759689 and a remainder of 5.95e-07.