We look at the division of 3991939 by 704 
The aim is to understand the frequency of 704 in 3991939.

Going ahead to step 1:
704 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 704

Let's proceed to step 2:
39 divided by 704 is 0 with a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Grab the next digit (9) from the dividend, add it to 39, then carry on: 399 / 704

On to step 3:
399 divided by 704 is 0 with a remainder of 399.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 399, we get 399.
Append the next digit (1) from the dividend to 399 and continue with: 3991 / 704

Going ahead to step 4:
When dividing 3991 by 704, we get 5 with a remainder of 471.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 3520 from 3991, we get 471.
Fetch the next digit (9) from the dividend, attach it to 471 and continue: 4719 / 704

Step 5:
When dividing 4719 by 704, we get 6 with a remainder of 495.
Use 6 as the next digit of our solution. 
Result so far: 56.0
Subtract 4224 from 4719 to get 495.
Take the next digit (3) from the dividend and append it to 495, then repeat: 4953 / 704

Going ahead to step 6:
The number 704 fits into 4953 7 times, leaving a remainder of 25.
The next digit of our result is 7. 
Result so far: 567.0
Subtract 4928 from 4953 to get 25.
Take the next digit (9) from the dividend and append it to 25, then repeat: 259 / 704

Moving on to step 7:
259 divided by 704 is 0 with a remainder of 259.
Record the quotient 0 as the next digit in the result. 
Result so far: 5670.0
Subtract 0 from 259 to get 259.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

Let's proceed to step 8:
2590 divided by 704 is 3 with a remainder of 478.
Write down 3 as next digit of the result. 
Result so far: 5670.3
If we take 2112 away from 2590, we end up with 478.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Moving on to step 9:
If we divide 4780 by 704, we get 6 and a remainder of 556.
Put 6 as the next digit of the answer. 
Result so far: 5670.36
Deduct 4224 from 4780 and we're left with 556.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5560, and continue the process.

Advancing to step 10:
When dividing 5560 by 704, we get 7 with a remainder of 632.
Record the quotient 7 as the next digit in the result. 
Result so far: 5670.367
If we take 4928 away from 5560, we end up with 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

On to step 11:
If we divide 6320 by 704, we get 8 and a remainder of 688.
The next digit of our result is 8. 
Result so far: 5670.3678
If we subtract 5632 from 6320, we get 688.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6880, and continue the process.

Step 12:
When dividing 6880 by 704, we get 9 with a remainder of 544.
Write down 9 as next digit of the result. 
Result so far: 5670.36789
If we subtract 6336 from 6880, we get 544.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5440, and continue the process.

Moving on to step 13:
5440 divided by 704 is 7 with a remainder of 512.
The number 7 becomes the next digit in our result. 
Result so far: 5670.367897
If we subtract 4928 from 5440, we get 512.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

Advancing to step 14:
5120 divided by 704 is 7 with a remainder of 192.
Put 7 as the next digit of the answer. 
Result so far: 5670.3678977
If we subtract 4928 from 5120, we get 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

The final result is 5670.3678977 with a remainder of 1.92e-06.