We divide 34176809 by 645
The aim is to understand the frequency of 645 in 34176809.

Moving on to step 1:
If we divide 3 by 645, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 645

Advancing to step 2:
The number 645 fits into 34 0 times, leaving a remainder of 34.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 34 to get 34.
Bring next digit (1) of the dividend behind the 34 and repeat the process: 341 / 645

Let's proceed to step 3:
645 can be fit into 341 0 times, resulting in a remainder of 341.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 341 after subtracting 0 from 341.
Fetch the next digit (7) from the dividend, attach it to 341 and continue: 3417 / 645

Advancing to step 4:
If we divide 3417 by 645, we get 5 and a remainder of 192.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 3225 away from 3417, we end up with 192.
Fetch the next digit (6) from the dividend, attach it to 192 and continue: 1926 / 645

Advancing to step 5:
1926 divided by 645 is 2 with a remainder of 636.
Use 2 as the next digit of our solution. 
Result so far: 52.0
The remainder is 636 after subtracting 1290 from 1926.
Take the next digit (8) from the dividend and append it to 636, then repeat: 6368 / 645

Going ahead to step 6:
When dividing 6368 by 645, we get 9 with a remainder of 563.
Use 9 as the next digit of our solution. 
Result so far: 529.0
Deduct 5805 from 6368 and we're left with 563.
Bring next digit (0) of the dividend behind the 563 and repeat the process: 5630 / 645

Step 7:
The number 645 fits into 5630 8 times, leaving a remainder of 470.
Record the quotient 8 as the next digit in the result. 
Result so far: 5298.0
If we subtract 5160 from 5630, we get 470.
Grab the next digit (9) from the dividend, add it to 470, then carry on: 4709 / 645

Moving on to step 8:
645 goes into 4709 7 times with a remainder of 194.
The next digit of our result is 7. 
Result so far: 52987.0
The remainder is 194 after subtracting 4515 from 4709.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Step 9:
When dividing 1940 by 645, we get 3 with a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 52987.3
If we take 1935 away from 1940, 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.

Let's proceed to step 10:
The number 645 fits into 50 0 times, leaving a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 52987.3
If we take 0 away from 50, 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.

On to step 11:
645 goes into 500 0 times with a remainder of 500.
The number 0 becomes the next digit in our result. 
Result so far: 52987.3
Subtract 0 from 500 to get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Our division results in 52987.3 with a remaining 0.05.