We look at the division of 402581 by 33 
The aim is to understand the frequency of 33 in 402581.

Let's proceed to step 1:
When dividing 4 by 33, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 33

Going ahead to step 2:
33 goes into 40 1 times with a remainder of 7.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 7 after subtracting 33 from 40.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 33

Going ahead to step 3:
When dividing 72 by 33, we get 2 with a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtract 66 from 72 to get 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 33

On to step 4:
When dividing 65 by 33, we get 1 with a remainder of 32.
Record the quotient 1 as the next digit in the result. 
Result so far: 121.0
If we take 33 away from 65, we end up with 32.
Grab the next digit (8) from the dividend, add it to 32, then carry on: 328 / 33

Moving on to step 5:
If we divide 328 by 33, we get 9 and a remainder of 31.
The number 9 becomes the next digit in our result. 
Result so far: 1219.0
Deduct 297 from 328 and we're left with 31.
Fetch the next digit (1) from the dividend, attach it to 31 and continue: 311 / 33

Let's proceed to step 6:
311 divided by 33 is 9 with a remainder of 14.
The number 9 becomes the next digit in our result. 
Result so far: 12199.0
The remainder is 14 after subtracting 297 from 311.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 7:
When dividing 140 by 33, we get 4 with a remainder of 8.
The next digit of our result is 4. 
Result so far: 12199.4
If we subtract 132 from 140, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 8:
When dividing 80 by 33, we get 2 with a remainder of 14.
Write down 2 as next digit of the result. 
Result so far: 12199.42
Deduct 66 from 80 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 9:
140 divided by 33 is 4 with a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 12199.424
Subtracting 132 from 140 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 10:
33 goes into 80 2 times with a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 12199.4242
The remainder is 14 after subtracting 66 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 11:
When dividing 140 by 33, we get 4 with a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 12199.42424
Subtracting 132 from 140 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 12:
When dividing 80 by 33, we get 2 with a remainder of 14.
The next digit of our result is 2. 
Result so far: 12199.424242
Subtract 66 from 80 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 13:
140 divided by 33 is 4 with a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 12199.4242424
If we subtract 132 from 140, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 14:
33 can be fit into 80 2 times, resulting in a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 12199.42424242
Subtracting 66 from 80 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 12199.42424242, with a leftover of 1.4e-08.