We're dividing 639661 by 34 
The aim is to understand the frequency of 34 in 639661.

On to step 1:
6 divided by 34 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 34

Going ahead to step 2:
63 divided by 34 is 1 with a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 34 from 63 and we're left with 29.
Include the next digit (9) from the dividend after 29, then repeat: 299 / 34

Step 3:
34 can be fit into 299 8 times, resulting in a remainder of 27.
Write down 8 as next digit of the result. 
Result so far: 18.0
Deduct 272 from 299 and we're left with 27.
Fetch the next digit (6) from the dividend, attach it to 27 and continue: 276 / 34

Advancing to step 4:
If we divide 276 by 34, we get 8 and a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 188.0
Subtracting 272 from 276 leaves us with 4.
Append the next digit (6) from the dividend to 4 and continue with: 46 / 34

Moving on to step 5:
34 goes into 46 1 times with a remainder of 12.
Record the quotient 1 as the next digit in the result. 
Result so far: 1881.0
The remainder is 12 after subtracting 34 from 46.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 34

On to step 6:
121 divided by 34 is 3 with a remainder of 19.
The number 3 becomes the next digit in our result. 
Result so far: 18813.0
If we subtract 102 from 121, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 7:
When dividing 190 by 34, we get 5 with a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 18813.5
The remainder is 20 after subtracting 170 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 8:
If we divide 200 by 34, we get 5 and a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 18813.55
If we take 170 away from 200, 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.

Our division results in 18813.55 with a remaining 0.03.