We look at the division of 33951536 by 669 
The aim is to understand the frequency of 669 in 33951536.

Step 1:
If we divide 3 by 669, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 669

Advancing to step 2:
33 divided by 669 is 0 with a remainder of 33.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 33 leaves us with 33.
Grab the next digit (9) from the dividend, add it to 33, then carry on: 339 / 669

Let's proceed to step 3:
The number 669 fits into 339 0 times, leaving a remainder of 339.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 339 and we're left with 339.
Take the next digit (5) from the dividend and append it to 339, then repeat: 3395 / 669

Advancing to step 4:
3395 divided by 669 is 5 with a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we subtract 3345 from 3395, we get 50.
Bring next digit (1) of the dividend behind the 50 and repeat the process: 501 / 669

Let's proceed to step 5:
501 divided by 669 is 0 with a remainder of 501.
Use 0 as the next digit of our solution. 
Result so far: 50.0
Subtract 0 from 501 to get 501.
Fetch the next digit (5) from the dividend, attach it to 501 and continue: 5015 / 669

Let's proceed to step 6:
669 can be fit into 5015 7 times, resulting in a remainder of 332.
The next digit of our result is 7. 
Result so far: 507.0
If we take 4683 away from 5015, we end up with 332.
Bring next digit (3) of the dividend behind the 332 and repeat the process: 3323 / 669

Advancing to step 7:
If we divide 3323 by 669, we get 4 and a remainder of 647.
Write down 4 as next digit of the result. 
Result so far: 5074.0
If we take 2676 away from 3323, we end up with 647.
Take the next digit (6) from the dividend and append it to 647, then repeat: 6476 / 669

On to step 8:
The number 669 fits into 6476 9 times, leaving a remainder of 455.
Use 9 as the next digit of our solution. 
Result so far: 50749.0
If we take 6021 away from 6476, we end up with 455.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4550, and continue the process.

Step 9:
4550 divided by 669 is 6 with a remainder of 536.
The next digit of our result is 6. 
Result so far: 50749.6
If we subtract 4014 from 4550, we get 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

On to step 10:
If we divide 5360 by 669, we get 8 and a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 50749.68
If we take 5352 away from 5360, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 11:
80 divided by 669 is 0 with a remainder of 80.
The next digit of our result is 0. 
Result so far: 50749.68
Subtracting 0 from 80 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 12:
If we divide 800 by 669, we get 1 and a remainder of 131.
Use 1 as the next digit of our solution. 
Result so far: 50749.6801
The remainder is 131 after subtracting 669 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1310, and continue the process.

On to step 13:
If we divide 1310 by 669, we get 1 and a remainder of 641.
Record the quotient 1 as the next digit in the result. 
Result so far: 50749.68011
Subtract 669 from 1310 to get 641.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6410, and continue the process.

The final outcome is 50749.68011, with a leftover of 0.000641.