We're dividing 55696565 by 645 
The aim is to understand the frequency of 645 in 55696565.

Going ahead to step 1:
If we divide 5 by 645, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 645

Going ahead to step 2:
55 divided by 645 is 0 with a remainder of 55.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 55 leaves us with 55.
Fetch the next digit (6) from the dividend, attach it to 55 and continue: 556 / 645

Going ahead to step 3:
The number 645 fits into 556 0 times, leaving a remainder of 556.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 556 after subtracting 0 from 556.
Grab the next digit (9) from the dividend, add it to 556, then carry on: 5569 / 645

Moving on to step 4:
The number 645 fits into 5569 8 times, leaving a remainder of 409.
The next digit of our result is 8. 
Result so far: 8.0
Subtracting 5160 from 5569 leaves us with 409.
Take the next digit (6) from the dividend and append it to 409, then repeat: 4096 / 645

Step 5:
When dividing 4096 by 645, we get 6 with a remainder of 226.
Use 6 as the next digit of our solution. 
Result so far: 86.0
If we subtract 3870 from 4096, we get 226.
Include the next digit (5) from the dividend after 226, then repeat: 2265 / 645

On to step 6:
645 goes into 2265 3 times with a remainder of 330.
Use 3 as the next digit of our solution. 
Result so far: 863.0
If we subtract 1935 from 2265, we get 330.
Fetch the next digit (6) from the dividend, attach it to 330 and continue: 3306 / 645

Moving on to step 7:
If we divide 3306 by 645, we get 5 and a remainder of 81.
Write down 5 as next digit of the result. 
Result so far: 8635.0
The remainder is 81 after subtracting 3225 from 3306.
Grab the next digit (5) from the dividend, add it to 81, then carry on: 815 / 645

Going ahead to step 8:
When dividing 815 by 645, we get 1 with a remainder of 170.
Put 1 as the next digit of the answer. 
Result so far: 86351.0
If we subtract 645 from 815, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Let's proceed to step 9:
When dividing 1700 by 645, we get 2 with a remainder of 410.
Put 2 as the next digit of the answer. 
Result so far: 86351.2
Deduct 1290 from 1700 and we're left with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

Step 10:
If we divide 4100 by 645, we get 6 and a remainder of 230.
The number 6 becomes the next digit in our result. 
Result so far: 86351.26
Subtract 3870 from 4100 to get 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Moving on to step 11:
When dividing 2300 by 645, we get 3 with a remainder of 365.
Write down 3 as next digit of the result. 
Result so far: 86351.263
Deduct 1935 from 2300 and we're left with 365.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3650, and continue the process.

Going ahead to step 12:
When dividing 3650 by 645, we get 5 with a remainder of 425.
Use 5 as the next digit of our solution. 
Result so far: 86351.2635
If we take 3225 away from 3650, we end up with 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Step 13:
4250 divided by 645 is 6 with a remainder of 380.
Put 6 as the next digit of the answer. 
Result so far: 86351.26356
If we take 3870 away from 4250, we end up with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Advancing to step 14:
3800 divided by 645 is 5 with a remainder of 575.
Use 5 as the next digit of our solution. 
Result so far: 86351.263565
The remainder is 575 after subtracting 3225 from 3800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5750, and continue the process.

On to step 15:
The number 645 fits into 5750 8 times, leaving a remainder of 590.
Record the quotient 8 as the next digit in the result. 
Result so far: 86351.2635658
The remainder is 590 after subtracting 5160 from 5750.
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 16:
The number 645 fits into 5900 9 times, leaving a remainder of 95.
Write down 9 as next digit of the result. 
Result so far: 86351.26356589
Subtract 5805 from 5900 to get 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Our division results in 86351.26356589 with a remaining 9.5e-08.