52083037 ÷ 645 
The aim is to understand the frequency of 645 in 52083037.

Let's proceed to step 1:
5 divided by 645 is 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 645

Advancing to step 2:
The number 645 fits into 52 0 times, leaving a remainder of 52.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 52 after subtracting 0 from 52.
Fetch the next digit (0) from the dividend, attach it to 52 and continue: 520 / 645

Moving on to step 3:
The number 645 fits into 520 0 times, leaving a remainder of 520.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 520 and we're left with 520.
Append the next digit (8) from the dividend to 520 and continue with: 5208 / 645

Going ahead to step 4:
645 can be fit into 5208 8 times, resulting in a remainder of 48.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
The remainder is 48 after subtracting 5160 from 5208.
Take the next digit (3) from the dividend and append it to 48, then repeat: 483 / 645

Moving on to step 5:
When dividing 483 by 645, we get 0 with a remainder of 483.
Use 0 as the next digit of our solution. 
Result so far: 80.0
Subtracting 0 from 483 leaves us with 483.
Bring next digit (0) of the dividend behind the 483 and repeat the process: 4830 / 645

Going ahead to step 6:
If we divide 4830 by 645, we get 7 and a remainder of 315.
The number 7 becomes the next digit in our result. 
Result so far: 807.0
If we subtract 4515 from 4830, we get 315.
Fetch the next digit (3) from the dividend, attach it to 315 and continue: 3153 / 645

On to step 7:
When dividing 3153 by 645, we get 4 with a remainder of 573.
The next digit of our result is 4. 
Result so far: 8074.0
Deduct 2580 from 3153 and we're left with 573.
Include the next digit (7) from the dividend after 573, then repeat: 5737 / 645

Going ahead to step 8:
When dividing 5737 by 645, we get 8 with a remainder of 577.
Put 8 as the next digit of the answer. 
Result so far: 80748.0
Subtracting 5160 from 5737 leaves us with 577.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5770, and continue the process.

Moving on to step 9:
When dividing 5770 by 645, we get 8 with a remainder of 610.
Put 8 as the next digit of the answer. 
Result so far: 80748.8
Deduct 5160 from 5770 and we're left with 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

Step 10:
The number 645 fits into 6100 9 times, leaving a remainder of 295.
Write down 9 as next digit of the result. 
Result so far: 80748.89
Subtracting 5805 from 6100 leaves us with 295.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2950, and continue the process.

On to step 11:
The number 645 fits into 2950 4 times, leaving a remainder of 370.
The next digit of our result is 4. 
Result so far: 80748.894
Subtract 2580 from 2950 to get 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Let's proceed to step 12:
The number 645 fits into 3700 5 times, leaving a remainder of 475.
The number 5 becomes the next digit in our result. 
Result so far: 80748.8945
If we subtract 3225 from 3700, we get 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Step 13:
When dividing 4750 by 645, we get 7 with a remainder of 235.
The number 7 becomes the next digit in our result. 
Result so far: 80748.89457
Subtract 4515 from 4750 to get 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Advancing to step 14:
When dividing 2350 by 645, we get 3 with a remainder of 415.
Put 3 as the next digit of the answer. 
Result so far: 80748.894573
The remainder is 415 after subtracting 1935 from 2350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Going ahead to step 15:
When dividing 4150 by 645, we get 6 with a remainder of 280.
Write down 6 as next digit of the result. 
Result so far: 80748.8945736
Subtracting 3870 from 4150 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Let's proceed to step 16:
2800 divided by 645 is 4 with a remainder of 220.
Use 4 as the next digit of our solution. 
Result so far: 80748.89457364
Deduct 2580 from 2800 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

The final outcome is 80748.89457364, with a leftover of 2.2e-07.