We divide 17812744 by 645
The aim is to understand the frequency of 645 in 17812744.

Let's proceed to step 1:
If we divide 1 by 645, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 645

Advancing to step 2:
645 can be fit into 17 0 times, resulting in a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 17 and we're left with 17.
Bring next digit (8) of the dividend behind the 17 and repeat the process: 178 / 645

On to step 3:
If we divide 178 by 645, we get 0 and a remainder of 178.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 178 and we're left with 178.
Bring next digit (1) of the dividend behind the 178 and repeat the process: 1781 / 645

Step 4:
1781 divided by 645 is 2 with a remainder of 491.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 1290 from 1781 and we're left with 491.
Fetch the next digit (2) from the dividend, attach it to 491 and continue: 4912 / 645

Going ahead to step 5:
645 goes into 4912 7 times with a remainder of 397.
Use 7 as the next digit of our solution. 
Result so far: 27.0
The remainder is 397 after subtracting 4515 from 4912.
Grab the next digit (7) from the dividend, add it to 397, then carry on: 3977 / 645

Going ahead to step 6:
3977 divided by 645 is 6 with a remainder of 107.
Put 6 as the next digit of the answer. 
Result so far: 276.0
Subtract 3870 from 3977 to get 107.
Bring next digit (4) of the dividend behind the 107 and repeat the process: 1074 / 645

On to step 7:
1074 divided by 645 is 1 with a remainder of 429.
The next digit of our result is 1. 
Result so far: 2761.0
Subtracting 645 from 1074 leaves us with 429.
Include the next digit (4) from the dividend after 429, then repeat: 4294 / 645

Going ahead to step 8:
645 can be fit into 4294 6 times, resulting in a remainder of 424.
The next digit of our result is 6. 
Result so far: 27616.0
If we take 3870 away from 4294, we end up with 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Advancing to step 9:
When dividing 4240 by 645, we get 6 with a remainder of 370.
Record the quotient 6 as the next digit in the result. 
Result so far: 27616.6
If we take 3870 away from 4240, we end up with 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3700, and continue the process.

Advancing to step 10:
If we divide 3700 by 645, we get 5 and a remainder of 475.
Record the quotient 5 as the next digit in the result. 
Result so far: 27616.65
Subtract 3225 from 3700 to 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 11:
4750 divided by 645 is 7 with a remainder of 235.
The next digit of our result is 7. 
Result so far: 27616.657
If we take 4515 away from 4750, we end up with 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Moving on to step 12:
645 goes into 2350 3 times with a remainder of 415.
Write down 3 as next digit of the result. 
Result so far: 27616.6573
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.

Let's proceed to step 13:
If we divide 4150 by 645, we get 6 and a remainder of 280.
Put 6 as the next digit of the answer. 
Result so far: 27616.65736
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.

On to step 14:
2800 divided by 645 is 4 with a remainder of 220.
Put 4 as the next digit of the answer. 
Result so far: 27616.657364
Subtracting 2580 from 2800 leaves us 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.

On to step 15:
If we divide 2200 by 645, we get 3 and a remainder of 265.
Write down 3 as next digit of the result. 
Result so far: 27616.6573643
Subtract 1935 from 2200 to get 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Let's proceed to step 16:
2650 divided by 645 is 4 with a remainder of 70.
The number 4 becomes the next digit in our result. 
Result so far: 27616.65736434
The remainder is 70 after subtracting 2580 from 2650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final result is 27616.65736434 with a remainder of 7e-08.