We look at the division of 803540 by 73 
The aim is to understand the frequency of 73 in 803540.

Going ahead to step 1:
8 divided by 73 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 73

Advancing to step 2:
If we divide 80 by 73, we get 1 and a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 73 away from 80, we end up with 7.
Grab the next digit (3) from the dividend, add it to 7, then carry on: 73 / 73

On to step 3:
73 divided by 73 is 1 with a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
The remainder is 0 after subtracting 73 from 73.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 73

Going ahead to step 4:
The number 73 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 110.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 73

On to step 5:
The number 73 fits into 54 0 times, leaving a remainder of 54.
Write down 0 as next digit of the result. 
Result so far: 1100.0
If we subtract 0 from 54, we get 54.
Fetch the next digit (0) from the dividend, attach it to 54 and continue: 540 / 73

Let's proceed to step 6:
The number 73 fits into 540 7 times, leaving a remainder of 29.
Record the quotient 7 as the next digit in the result. 
Result so far: 11007.0
The remainder is 29 after subtracting 511 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Advancing to step 7:
73 can be fit into 290 3 times, resulting in a remainder of 71.
The next digit of our result is 3. 
Result so far: 11007.3
The remainder is 71 after subtracting 219 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Step 8:
The number 73 fits into 710 9 times, leaving a remainder of 53.
Use 9 as the next digit of our solution. 
Result so far: 11007.39
If we subtract 657 from 710, we get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Let's proceed to step 9:
73 goes into 530 7 times with a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 11007.397
The remainder is 19 after subtracting 511 from 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 10:
If we divide 190 by 73, we get 2 and a remainder of 44.
Use 2 as the next digit of our solution. 
Result so far: 11007.3972
If we take 146 away from 190, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 11:
When dividing 440 by 73, we get 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 11007.39726
Deduct 438 from 440 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 12:
If we divide 20 by 73, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 11007.39726
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 13:
200 divided by 73 is 2 with a remainder of 54.
Record the quotient 2 as the next digit in the result. 
Result so far: 11007.3972602
If we take 146 away from 200, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 14:
If we divide 540 by 73, we get 7 and a remainder of 29.
Record the quotient 7 as the next digit in the result. 
Result so far: 11007.39726027
The remainder is 29 after subtracting 511 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final outcome is 11007.39726027, with a leftover of 2.9e-08.