We're dividing 53807681 by 669 
The aim is to understand the frequency of 669 in 53807681.

Moving on to step 1:
When dividing 5 by 669, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 669

Let's proceed to step 2:
53 divided by 669 is 0 with a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 53, we end up with 53.
Grab the next digit (8) from the dividend, add it to 53, then carry on: 538 / 669

On to step 3:
669 goes into 538 0 times with a remainder of 538.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 538 and we're left with 538.
Bring next digit (0) of the dividend behind the 538 and repeat the process: 5380 / 669

Let's proceed to step 4:
669 can be fit into 5380 8 times, resulting in a remainder of 28.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
The remainder is 28 after subtracting 5352 from 5380.
Bring next digit (7) of the dividend behind the 28 and repeat the process: 287 / 669

On to step 5:
669 goes into 287 0 times with a remainder of 287.
Put 0 as the next digit of the answer. 
Result so far: 80.0
If we take 0 away from 287, we end up with 287.
Append the next digit (6) from the dividend to 287 and continue with: 2876 / 669

Advancing to step 6:
If we divide 2876 by 669, we get 4 and a remainder of 200.
The number 4 becomes the next digit in our result. 
Result so far: 804.0
Subtract 2676 from 2876 to get 200.
Bring next digit (8) of the dividend behind the 200 and repeat the process: 2008 / 669

Advancing to step 7:
2008 divided by 669 is 3 with a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 8043.0
If we subtract 2007 from 2008, we get 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 669

On to step 8:
The number 669 fits into 11 0 times, leaving a remainder of 11.
Record the quotient 0 as the next digit in the result. 
Result so far: 80430.0
If we take 0 away from 11, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 9:
110 divided by 669 is 0 with a remainder of 110.
Use 0 as the next digit of our solution. 
Result so far: 80430.0
Subtracting 0 from 110 leaves us with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Moving on to step 10:
If we divide 1100 by 669, we get 1 and a remainder of 431.
Use 1 as the next digit of our solution. 
Result so far: 80430.01
If we take 669 away from 1100, we end up with 431.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4310, and continue the process.

Moving on to step 11:
When dividing 4310 by 669, we get 6 with a remainder of 296.
Write down 6 as next digit of the result. 
Result so far: 80430.016
Deduct 4014 from 4310 and we're left with 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Step 12:
669 goes into 2960 4 times with a remainder of 284.
The number 4 becomes the next digit in our result. 
Result so far: 80430.0164
Subtract 2676 from 2960 to get 284.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

Advancing to step 13:
The number 669 fits into 2840 4 times, leaving a remainder of 164.
Write down 4 as next digit of the result. 
Result so far: 80430.01644
Deduct 2676 from 2840 and we're left with 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

The final outcome is 80430.01644, with a leftover of 0.000164.