4775585 divided by 645 
The aim is to understand the frequency of 645 in 4775585.

Advancing to step 1:
645 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Bring next digit (7) of the dividend behind the 4 and repeat the process: 47 / 645

Advancing to step 2:
When dividing 47 by 645, we get 0 with a remainder of 47.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 47 leaves us with 47.
Bring next digit (7) of the dividend behind the 47 and repeat the process: 477 / 645

On to step 3:
If we divide 477 by 645, we get 0 and a remainder of 477.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 477 to get 477.
Append the next digit (5) from the dividend to 477 and continue with: 4775 / 645

Step 4:
4775 divided by 645 is 7 with a remainder of 260.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtracting 4515 from 4775 leaves us with 260.
Bring next digit (5) of the dividend behind the 260 and repeat the process: 2605 / 645

Going ahead to step 5:
The number 645 fits into 2605 4 times, leaving a remainder of 25.
The number 4 becomes the next digit in our result. 
Result so far: 74.0
If we take 2580 away from 2605, we end up with 25.
Include the next digit (8) from the dividend after 25, then repeat: 258 / 645

Going ahead to step 6:
When dividing 258 by 645, we get 0 with a remainder of 258.
The next digit of our result is 0. 
Result so far: 740.0
Subtract 0 from 258 to get 258.
Include the next digit (5) from the dividend after 258, then repeat: 2585 / 645

Moving on to step 7:
If we divide 2585 by 645, we get 4 and a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 7404.0
If we subtract 2580 from 2585, we 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.

Let's proceed to step 8:
If we divide 50 by 645, we get 0 and a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 7404.0
If we subtract 0 from 50, 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.

Moving on to step 9:
645 goes into 500 0 times with a remainder of 500.
Record the quotient 0 as the next digit in the result. 
Result so far: 7404.0
If we take 0 away from 500, we end up 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.

The quotient of the division is 7404.0, and the remainder is 0.5.