We look at the division of 869399 by 73 
The aim is to understand the frequency of 73 in 869399.

Moving on to step 1:
If we divide 8 by 73, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 73

Going ahead to step 2:
86 divided by 73 is 1 with a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 73 from 86 and we're left with 13.
Include the next digit (9) from the dividend after 13, then repeat: 139 / 73

Step 3:
139 divided by 73 is 1 with a remainder of 66.
Put 1 as the next digit of the answer. 
Result so far: 11.0
If we take 73 away from 139, we end up with 66.
Grab the next digit (3) from the dividend, add it to 66, then carry on: 663 / 73

Advancing to step 4:
If we divide 663 by 73, we get 9 and a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 119.0
The remainder is 6 after subtracting 657 from 663.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 73

On to step 5:
When dividing 69 by 73, we get 0 with a remainder of 69.
Write down 0 as next digit of the result. 
Result so far: 1190.0
The remainder is 69 after subtracting 0 from 69.
Grab the next digit (9) from the dividend, add it to 69, then carry on: 699 / 73

On to step 6:
699 divided by 73 is 9 with a remainder of 42.
Put 9 as the next digit of the answer. 
Result so far: 11909.0
If we take 657 away from 699, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 7:
The number 73 fits into 420 5 times, leaving a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 11909.5
Deduct 365 from 420 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 8:
550 divided by 73 is 7 with a remainder of 39.
Use 7 as the next digit of our solution. 
Result so far: 11909.57
The remainder is 39 after subtracting 511 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 9:
When dividing 390 by 73, we get 5 with a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 11909.575
Deduct 365 from 390 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 10:
When dividing 250 by 73, we get 3 with a remainder of 31.
Record the quotient 3 as the next digit in the result. 
Result so far: 11909.5753
If we subtract 219 from 250, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 11:
310 divided by 73 is 4 with a remainder of 18.
Write down 4 as next digit of the result. 
Result so far: 11909.57534
Subtracting 292 from 310 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 12:
73 can be fit into 180 2 times, resulting in a remainder of 34.
The number 2 becomes the next digit in our result. 
Result so far: 11909.575342
If we take 146 away from 180, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 13:
If we divide 340 by 73, we get 4 and a remainder of 48.
The number 4 becomes the next digit in our result. 
Result so far: 11909.5753424
If we take 292 away from 340, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 14:
If we divide 480 by 73, we get 6 and a remainder of 42.
Put 6 as the next digit of the answer. 
Result so far: 11909.57534246
Subtract 438 from 480 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

After the division, we end up with 11909.57534246 and a remainder of 4.2e-08.