We look at the division of 571945 by 73 
The aim is to understand the frequency of 73 in 571945.

Going ahead to step 1:
73 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 73

Step 2:
57 divided by 73 is 0 with a remainder of 57.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 57 after subtracting 0 from 57.
Bring next digit (1) of the dividend behind the 57 and repeat the process: 571 / 73

Going ahead to step 3:
When dividing 571 by 73, we get 7 with a remainder of 60.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we subtract 511 from 571, we get 60.
Include the next digit (9) from the dividend after 60, then repeat: 609 / 73

Advancing to step 4:
73 goes into 609 8 times with a remainder of 25.
Put 8 as the next digit of the answer. 
Result so far: 78.0
If we subtract 584 from 609, we get 25.
Grab the next digit (4) from the dividend, add it to 25, then carry on: 254 / 73

Step 5:
If we divide 254 by 73, we get 3 and a remainder of 35.
The next digit of our result is 3. 
Result so far: 783.0
If we subtract 219 from 254, we get 35.
Append the next digit (5) from the dividend to 35 and continue with: 355 / 73

Moving on to step 6:
73 goes into 355 4 times with a remainder of 63.
Use 4 as the next digit of our solution. 
Result so far: 7834.0
Subtracting 292 from 355 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 7:
The number 73 fits into 630 8 times, leaving a remainder of 46.
Record the quotient 8 as the next digit in the result. 
Result so far: 7834.8
If we subtract 584 from 630, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 8:
When dividing 460 by 73, we get 6 with a remainder of 22.
Use 6 as the next digit of our solution. 
Result so far: 7834.86
The remainder is 22 after subtracting 438 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 9:
The number 73 fits into 220 3 times, leaving a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 7834.863
Deduct 219 from 220 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 10:
When dividing 10 by 73, we get 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 7834.863
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 11:
If we divide 100 by 73, we get 1 and a remainder of 27.
The next digit of our result is 1. 
Result so far: 7834.86301
Subtract 73 from 100 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 12:
The number 73 fits into 270 3 times, leaving a remainder of 51.
Use 3 as the next digit of our solution. 
Result so far: 7834.863013
Subtract 219 from 270 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Let's proceed to step 13:
The number 73 fits into 510 6 times, leaving a remainder of 72.
The number 6 becomes the next digit in our result. 
Result so far: 7834.8630136
If we subtract 438 from 510, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 14:
The number 73 fits into 720 9 times, leaving a remainder of 63.
The next digit of our result is 9. 
Result so far: 7834.86301369
Deduct 657 from 720 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

The final result is 7834.86301369 with a remainder of 6.3e-08.