We look at the division of 53502789 by 39 
The aim is to understand the frequency of 39 in 53502789.

On to step 1:
If we divide 5 by 39, we get 0 and a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 39

Let's proceed to step 2:
When dividing 53 by 39, we get 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 39 from 53, we get 14.
Grab the next digit (5) from the dividend, add it to 14, then carry on: 145 / 39

Let's proceed to step 3:
39 goes into 145 3 times with a remainder of 28.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Deduct 117 from 145 and we're left with 28.
Bring next digit (0) of the dividend behind the 28 and repeat the process: 280 / 39

Moving on to step 4:
When dividing 280 by 39, we get 7 with a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 137.0
Subtract 273 from 280 to get 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 39

Step 5:
If we divide 72 by 39, we get 1 and a remainder of 33.
The number 1 becomes the next digit in our result. 
Result so far: 1371.0
Deduct 39 from 72 and we're left with 33.
Take the next digit (7) from the dividend and append it to 33, then repeat: 337 / 39

Going ahead to step 6:
If we divide 337 by 39, we get 8 and a remainder of 25.
The number 8 becomes the next digit in our result. 
Result so far: 13718.0
Deduct 312 from 337 and we're left with 25.
Include the next digit (8) from the dividend after 25, then repeat: 258 / 39

Going ahead to step 7:
258 divided by 39 is 6 with a remainder of 24.
The next digit of our result is 6. 
Result so far: 137186.0
The remainder is 24 after subtracting 234 from 258.
Take the next digit (9) from the dividend and append it to 24, then repeat: 249 / 39

Step 8:
39 can be fit into 249 6 times, resulting in a remainder of 15.
Write down 6 as next digit of the result. 
Result so far: 1371866.0
The remainder is 15 after subtracting 234 from 249.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 9:
When dividing 150 by 39, we get 3 with a remainder of 33.
Use 3 as the next digit of our solution. 
Result so far: 1371866.3
Subtract 117 from 150 to get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Advancing to step 10:
When dividing 330 by 39, we get 8 with a remainder of 18.
Put 8 as the next digit of the answer. 
Result so far: 1371866.38
Subtracting 312 from 330 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.

On to step 11:
180 divided by 39 is 4 with a remainder of 24.
Record the quotient 4 as the next digit in the result. 
Result so far: 1371866.384
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.

Going ahead to step 12:
The number 39 fits into 240 6 times, leaving a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 1371866.3846
If we take 234 away from 240, we end up 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 13:
If we divide 60 by 39, we get 1 and a remainder of 21.
Write down 1 as next digit of the result. 
Result so far: 1371866.38461
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.

Going ahead to step 14:
When dividing 210 by 39, we get 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 1371866.384615
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.

Advancing to step 15:
39 goes into 150 3 times with a remainder of 33.
Write down 3 as next digit of the result. 
Result so far: 1371866.3846153
Subtract 117 from 150 to get 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 16:
The number 39 fits into 330 8 times, leaving a remainder of 18.
Record the quotient 8 as the next digit in the result. 
Result so far: 1371866.38461538
Subtracting 312 from 330 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.

Our division results in 1371866.38461538 with a remaining 1.8e-08.