We look at the division of 43916290 by 669 
The aim is to understand the frequency of 669 in 43916290.

Advancing to step 1:
669 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 669

Let's proceed to step 2:
When dividing 43 by 669, we get 0 with a remainder of 43.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 43 leaves us with 43.
Include the next digit (9) from the dividend after 43, then repeat: 439 / 669

Let's proceed to step 3:
If we divide 439 by 669, we get 0 and a remainder of 439.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 439 after subtracting 0 from 439.
Grab the next digit (1) from the dividend, add it to 439, then carry on: 4391 / 669

Step 4:
4391 divided by 669 is 6 with a remainder of 377.
The next digit of our result is 6. 
Result so far: 6.0
Subtract 4014 from 4391 to get 377.
Grab the next digit (6) from the dividend, add it to 377, then carry on: 3776 / 669

Going ahead to step 5:
If we divide 3776 by 669, we get 5 and a remainder of 431.
Write down 5 as next digit of the result. 
Result so far: 65.0
Deduct 3345 from 3776 and we're left with 431.
Take the next digit (2) from the dividend and append it to 431, then repeat: 4312 / 669

Moving on to step 6:
4312 divided by 669 is 6 with a remainder of 298.
Record the quotient 6 as the next digit in the result. 
Result so far: 656.0
The remainder is 298 after subtracting 4014 from 4312.
Fetch the next digit (9) from the dividend, attach it to 298 and continue: 2989 / 669

On to step 7:
When dividing 2989 by 669, we get 4 with a remainder of 313.
Use 4 as the next digit of our solution. 
Result so far: 6564.0
Subtracting 2676 from 2989 leaves us with 313.
Grab the next digit (0) from the dividend, add it to 313, then carry on: 3130 / 669

On to step 8:
669 goes into 3130 4 times with a remainder of 454.
Put 4 as the next digit of the answer. 
Result so far: 65644.0
If we subtract 2676 from 3130, we get 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

Step 9:
The number 669 fits into 4540 6 times, leaving a remainder of 526.
The next digit of our result is 6. 
Result so far: 65644.6
Subtracting 4014 from 4540 leaves us with 526.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5260, and continue the process.

Advancing to step 10:
The number 669 fits into 5260 7 times, leaving a remainder of 577.
Use 7 as the next digit of our solution. 
Result so far: 65644.67
Subtract 4683 from 5260 to get 577.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5770, and continue the process.

Let's proceed to step 11:
669 goes into 5770 8 times with a remainder of 418.
The next digit of our result is 8. 
Result so far: 65644.678
The remainder is 418 after subtracting 5352 from 5770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4180, and continue the process.

Moving on to step 12:
669 can be fit into 4180 6 times, resulting in a remainder of 166.
Record the quotient 6 as the next digit in the result. 
Result so far: 65644.6786
If we take 4014 away from 4180, we end up with 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

On to step 13:
669 goes into 1660 2 times with a remainder of 322.
The next digit of our result is 2. 
Result so far: 65644.67862
If we take 1338 away from 1660, we end up with 322.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3220, and continue the process.

Advancing to step 14:
3220 divided by 669 is 4 with a remainder of 544.
Write down 4 as next digit of the result. 
Result so far: 65644.678624
Subtracting 2676 from 3220 leaves us with 544.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5440, and continue the process.

On to step 15:
669 goes into 5440 8 times with a remainder of 88.
Write down 8 as next digit of the result. 
Result so far: 65644.6786248
The remainder is 88 after subtracting 5352 from 5440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Step 16:
If we divide 880 by 669, we get 1 and a remainder of 211.
Write down 1 as next digit of the result. 
Result so far: 65644.67862481
If we take 669 away from 880, we end up with 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

In conclusion, the division gives 65644.67862481 with a balance of 2.11e-07.