Let's divide 405120 by 39
The aim is to understand the frequency of 39 in 405120.

Moving on to step 1:
The number 39 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 39

Advancing to step 2:
The number 39 fits into 40 1 times, leaving a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 39 from 40, we get 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 39

Let's proceed to step 3:
When dividing 15 by 39, we get 0 with a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 10.0
The remainder is 15 after subtracting 0 from 15.
Bring next digit (1) of the dividend behind the 15 and repeat the process: 151 / 39

Advancing to step 4:
151 divided by 39 is 3 with a remainder of 34.
The number 3 becomes the next digit in our result. 
Result so far: 103.0
Subtracting 117 from 151 leaves us with 34.
Include the next digit (2) from the dividend after 34, then repeat: 342 / 39

Going ahead to step 5:
39 can be fit into 342 8 times, resulting in a remainder of 30.
Write down 8 as next digit of the result. 
Result so far: 1038.0
If we take 312 away from 342, we end up with 30.
Include the next digit (0) from the dividend after 30, then repeat: 300 / 39

Going ahead to step 6:
The number 39 fits into 300 7 times, leaving a remainder of 27.
Record the quotient 7 as the next digit in the result. 
Result so far: 10387.0
If we subtract 273 from 300, we 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.

Advancing to step 7:
The number 39 fits into 270 6 times, leaving a remainder of 36.
The number 6 becomes the next digit in our result. 
Result so far: 10387.6
If we take 234 away from 270, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 8:
The number 39 fits into 360 9 times, leaving a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 10387.69
Subtract 351 from 360 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 9:
39 can be fit into 90 2 times, resulting in a remainder of 12.
The next digit of our result is 2. 
Result so far: 10387.692
If we take 78 away from 90, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 10:
120 divided by 39 is 3 with a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 10387.6923
Subtract 117 from 120 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 11:
39 goes into 30 0 times with a remainder of 30.
The next digit of our result is 0. 
Result so far: 10387.6923
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 12:
300 divided by 39 is 7 with a remainder of 27.
Use 7 as the next digit of our solution. 
Result so far: 10387.692307
Subtracting 273 from 300 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 13:
When dividing 270 by 39, we get 6 with a remainder of 36.
The number 6 becomes the next digit in our result. 
Result so far: 10387.6923076
If we take 234 away from 270, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 14:
When dividing 360 by 39, we get 9 with a remainder of 9.
Write down 9 as next digit of the result. 
Result so far: 10387.69230769
If we subtract 351 from 360, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

The quotient of the division is 10387.69230769, and the remainder is 9e-09.