Let's divide 901233 by 39
The aim is to understand the frequency of 39 in 901233.

On to step 1:
9 divided by 39 is 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 39

Moving on to step 2:
The number 39 fits into 90 2 times, leaving a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 78 from 90 leaves us with 12.
Bring next digit (1) of the dividend behind the 12 and repeat the process: 121 / 39

Step 3:
If we divide 121 by 39, we get 3 and a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
Subtract 117 from 121 to get 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 39

Going ahead to step 4:
39 goes into 42 1 times with a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 231.0
If we subtract 39 from 42, we get 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 39

Step 5:
39 goes into 33 0 times with a remainder of 33.
The next digit of our result is 0. 
Result so far: 2310.0
Deduct 0 from 33 and we're left with 33.
Bring next digit (3) of the dividend behind the 33 and repeat the process: 333 / 39

Advancing to step 6:
39 goes into 333 8 times with a remainder of 21.
The number 8 becomes the next digit in our result. 
Result so far: 23108.0
The remainder is 21 after subtracting 312 from 333.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Let's proceed to step 7:
The number 39 fits into 210 5 times, leaving a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 23108.5
The remainder is 15 after subtracting 195 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 8:
The number 39 fits into 150 3 times, leaving a remainder of 33.
Put 3 as the next digit of the answer. 
Result so far: 23108.53
Subtracting 117 from 150 leaves us with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Step 9:
39 can be fit into 330 8 times, resulting in a remainder of 18.
The next digit of our result is 8. 
Result so far: 23108.538
The remainder is 18 after subtracting 312 from 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 10:
39 can be fit into 180 4 times, resulting in a remainder of 24.
Record the quotient 4 as the next digit in the result. 
Result so far: 23108.5384
Deduct 156 from 180 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 11:
39 can be fit into 240 6 times, resulting in a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 23108.53846
Deduct 234 from 240 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 12:
When dividing 60 by 39, we get 1 with a remainder of 21.
Put 1 as the next digit of the answer. 
Result so far: 23108.538461
If we take 39 away from 60, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 13:
39 goes into 210 5 times with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 23108.5384615
If we subtract 195 from 210, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 14:
If we divide 150 by 39, we get 3 and a remainder of 33.
Use 3 as the next digit of our solution. 
Result so far: 23108.53846153
Deduct 117 from 150 and we're left with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

The final outcome is 23108.53846153, with a leftover of 3.3e-08.