839972 ÷ 39 
The aim is to understand the frequency of 39 in 839972.

Advancing to step 1:
The number 39 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 39

On to step 2:
83 divided by 39 is 2 with a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 78 from 83 to get 5.
Append the next digit (9) from the dividend to 5 and continue with: 59 / 39

Let's proceed to step 3:
39 can be fit into 59 1 times, resulting in a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 21.0
If we take 39 away from 59, we end up with 20.
Grab the next digit (9) from the dividend, add it to 20, then carry on: 209 / 39

Let's proceed to step 4:
The number 39 fits into 209 5 times, leaving a remainder of 14.
Use 5 as the next digit of our solution. 
Result so far: 215.0
If we subtract 195 from 209, we get 14.
Fetch the next digit (7) from the dividend, attach it to 14 and continue: 147 / 39

Moving on to step 5:
If we divide 147 by 39, we get 3 and a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 2153.0
Subtracting 117 from 147 leaves us with 30.
Bring next digit (2) of the dividend behind the 30 and repeat the process: 302 / 39

Going ahead to step 6:
39 goes into 302 7 times with a remainder of 29.
Record the quotient 7 as the next digit in the result. 
Result so far: 21537.0
The remainder is 29 after subtracting 273 from 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 7:
39 goes into 290 7 times with a remainder of 17.
Use 7 as the next digit of our solution. 
Result so far: 21537.7
The remainder is 17 after subtracting 273 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 8:
The number 39 fits into 170 4 times, leaving a remainder of 14.
The next digit of our result is 4. 
Result so far: 21537.74
If we take 156 away from 170, we end up 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.

Let's proceed to step 9:
140 divided by 39 is 3 with a remainder of 23.
Record the quotient 3 as the next digit in the result. 
Result so far: 21537.743
Subtracting 117 from 140 leaves us with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

On to step 10:
39 can be fit into 230 5 times, resulting in a remainder of 35.
Record the quotient 5 as the next digit in the result. 
Result so far: 21537.7435
Deduct 195 from 230 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 11:
39 can be fit into 350 8 times, resulting in a remainder of 38.
Write down 8 as next digit of the result. 
Result so far: 21537.74358
Subtracting 312 from 350 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 12:
380 divided by 39 is 9 with a remainder of 29.
Use 9 as the next digit of our solution. 
Result so far: 21537.743589
Deduct 351 from 380 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Going ahead to step 13:
The number 39 fits into 290 7 times, leaving a remainder of 17.
Record the quotient 7 as the next digit in the result. 
Result so far: 21537.7435897
If we take 273 away from 290, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 14:
39 can be fit into 170 4 times, resulting in a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 21537.74358974
Subtract 156 from 170 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.

Our division results in 21537.74358974 with a remaining 1.4e-08.