1731967 ÷ 639 
The aim is to understand the frequency of 639 in 1731967.

Moving on to step 1:
When dividing 1 by 639, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 639

Moving on to step 2:
If we divide 17 by 639, we get 0 and a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Fetch the next digit (3) from the dividend, attach it to 17 and continue: 173 / 639

Advancing to step 3:
639 goes into 173 0 times with a remainder of 173.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 173, we get 173.
Include the next digit (1) from the dividend after 173, then repeat: 1731 / 639

On to step 4:
If we divide 1731 by 639, we get 2 and a remainder of 453.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 1278 away from 1731, we end up with 453.
Include the next digit (9) from the dividend after 453, then repeat: 4539 / 639

Advancing to step 5:
When dividing 4539 by 639, we get 7 with a remainder of 66.
Record the quotient 7 as the next digit in the result. 
Result so far: 27.0
The remainder is 66 after subtracting 4473 from 4539.
Bring next digit (6) of the dividend behind the 66 and repeat the process: 666 / 639

Moving on to step 6:
666 divided by 639 is 1 with a remainder of 27.
Use 1 as the next digit of our solution. 
Result so far: 271.0
The remainder is 27 after subtracting 639 from 666.
Include the next digit (7) from the dividend after 27, then repeat: 277 / 639

Going ahead to step 7:
The number 639 fits into 277 0 times, leaving a remainder of 277.
The next digit of our result is 0. 
Result so far: 2710.0
Deduct 0 from 277 and we're left with 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

On to step 8:
If we divide 2770 by 639, we get 4 and a remainder of 214.
The number 4 becomes the next digit in our result. 
Result so far: 2710.4
Subtract 2556 from 2770 to get 214.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Moving on to step 9:
The number 639 fits into 2140 3 times, leaving a remainder of 223.
Write down 3 as next digit of the result. 
Result so far: 2710.43
The remainder is 223 after subtracting 1917 from 2140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2230, and continue the process.

Let's proceed to step 10:
639 goes into 2230 3 times with a remainder of 313.
Write down 3 as next digit of the result. 
Result so far: 2710.433
Deduct 1917 from 2230 and we're left with 313.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3130, and continue the process.

The final result is 2710.433 with a remainder of 0.0313.