We look at the division of 93743737 by 645 
The aim is to understand the frequency of 645 in 93743737.

Let's proceed to step 1:
645 goes into 9 0 times with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Grab the next digit (3) from the dividend, add it to 9, then carry on: 93 / 645

Moving on to step 2:
The number 645 fits into 93 0 times, leaving a remainder of 93.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 93, we end up with 93.
Fetch the next digit (7) from the dividend, attach it to 93 and continue: 937 / 645

Advancing to step 3:
645 goes into 937 1 times with a remainder of 292.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 645 from 937 to get 292.
Include the next digit (4) from the dividend after 292, then repeat: 2924 / 645

Step 4:
If we divide 2924 by 645, we get 4 and a remainder of 344.
Use 4 as the next digit of our solution. 
Result so far: 14.0
The remainder is 344 after subtracting 2580 from 2924.
Bring next digit (3) of the dividend behind the 344 and repeat the process: 3443 / 645

Step 5:
645 can be fit into 3443 5 times, resulting in a remainder of 218.
Record the quotient 5 as the next digit in the result. 
Result so far: 145.0
If we subtract 3225 from 3443, we get 218.
Include the next digit (7) from the dividend after 218, then repeat: 2187 / 645

On to step 6:
645 can be fit into 2187 3 times, resulting in a remainder of 252.
Put 3 as the next digit of the answer. 
Result so far: 1453.0
Deduct 1935 from 2187 and we're left with 252.
Fetch the next digit (3) from the dividend, attach it to 252 and continue: 2523 / 645

Going ahead to step 7:
If we divide 2523 by 645, we get 3 and a remainder of 588.
The number 3 becomes the next digit in our result. 
Result so far: 14533.0
Deduct 1935 from 2523 and we're left with 588.
Bring next digit (7) of the dividend behind the 588 and repeat the process: 5887 / 645

Going ahead to step 8:
When dividing 5887 by 645, we get 9 with a remainder of 82.
The next digit of our result is 9. 
Result so far: 145339.0
Subtract 5805 from 5887 to get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Let's proceed to step 9:
820 divided by 645 is 1 with a remainder of 175.
Write down 1 as next digit of the result. 
Result so far: 145339.1
If we take 645 away from 820, we end up with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Moving on to step 10:
If we divide 1750 by 645, we get 2 and a remainder of 460.
Put 2 as the next digit of the answer. 
Result so far: 145339.12
Subtracting 1290 from 1750 leaves us with 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Step 11:
645 goes into 4600 7 times with a remainder of 85.
The number 7 becomes the next digit in our result. 
Result so far: 145339.127
Deduct 4515 from 4600 and we're left with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

On to step 12:
850 divided by 645 is 1 with a remainder of 205.
The number 1 becomes the next digit in our result. 
Result so far: 145339.1271
Subtract 645 from 850 to get 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Step 13:
2050 divided by 645 is 3 with a remainder of 115.
The next digit of our result is 3. 
Result so far: 145339.12713
If we take 1935 away from 2050, we end up with 115.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1150, and continue the process.

Going ahead to step 14:
If we divide 1150 by 645, we get 1 and a remainder of 505.
The next digit of our result is 1. 
Result so far: 145339.127131
The remainder is 505 after subtracting 645 from 1150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

Let's proceed to step 15:
5050 divided by 645 is 7 with a remainder of 535.
Record the quotient 7 as the next digit in the result. 
Result so far: 145339.1271317
Subtract 4515 from 5050 to get 535.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5350, and continue the process.

Moving on to step 16:
645 goes into 5350 8 times with a remainder of 190.
Write down 8 as next digit of the result. 
Result so far: 145339.12713178
Subtract 5160 from 5350 to get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

After the division, we end up with 145339.12713178 and a remainder of 1.9e-07.