We're dividing 13659428 by 690 
The aim is to understand the frequency of 690 in 13659428.

Advancing to step 1:
If we divide 1 by 690, we get 0 and a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 690

Moving on to step 2:
690 goes into 13 0 times with a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 13, we end up with 13.
Bring next digit (6) of the dividend behind the 13 and repeat the process: 136 / 690

Let's proceed to step 3:
690 can be fit into 136 0 times, resulting in a remainder of 136.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 136 leaves us with 136.
Grab the next digit (5) from the dividend, add it to 136, then carry on: 1365 / 690

Step 4:
690 can be fit into 1365 1 times, resulting in a remainder of 675.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 690 from 1365, we get 675.
Include the next digit (9) from the dividend after 675, then repeat: 6759 / 690

On to step 5:
The number 690 fits into 6759 9 times, leaving a remainder of 549.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtract 6210 from 6759 to get 549.
Append the next digit (4) from the dividend to 549 and continue with: 5494 / 690

Moving on to step 6:
690 can be fit into 5494 7 times, resulting in a remainder of 664.
The next digit of our result is 7. 
Result so far: 197.0
Subtract 4830 from 5494 to get 664.
Take the next digit (2) from the dividend and append it to 664, then repeat: 6642 / 690

Going ahead to step 7:
If we divide 6642 by 690, we get 9 and a remainder of 432.
The next digit of our result is 9. 
Result so far: 1979.0
The remainder is 432 after subtracting 6210 from 6642.
Take the next digit (8) from the dividend and append it to 432, then repeat: 4328 / 690

On to step 8:
690 goes into 4328 6 times with a remainder of 188.
Record the quotient 6 as the next digit in the result. 
Result so far: 19796.0
Deduct 4140 from 4328 and we're left with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Advancing to step 9:
1880 divided by 690 is 2 with a remainder of 500.
Write down 2 as next digit of the result. 
Result so far: 19796.2
The remainder is 500 after subtracting 1380 from 1880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Let's proceed to step 10:
When dividing 5000 by 690, we get 7 with a remainder of 170.
The next digit of our result is 7. 
Result so far: 19796.27
If we subtract 4830 from 5000, we get 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1700, and continue the process.

Moving on to step 11:
1700 divided by 690 is 2 with a remainder of 320.
Write down 2 as next digit of the result. 
Result so far: 19796.272
Subtract 1380 from 1700 to get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 12:
The number 690 fits into 3200 4 times, leaving a remainder of 440.
The number 4 becomes the next digit in our result. 
Result so far: 19796.2724
If we subtract 2760 from 3200, we get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Advancing to step 13:
If we divide 4400 by 690, we get 6 and a remainder of 260.
Use 6 as the next digit of our solution. 
Result so far: 19796.27246
If we subtract 4140 from 4400, we get 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Advancing to step 14:
When dividing 2600 by 690, we get 3 with a remainder of 530.
The next digit of our result is 3. 
Result so far: 19796.272463
If we subtract 2070 from 2600, we get 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Step 15:
The number 690 fits into 5300 7 times, leaving a remainder of 470.
The number 7 becomes the next digit in our result. 
Result so far: 19796.2724637
The remainder is 470 after subtracting 4830 from 5300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Going ahead to step 16:
The number 690 fits into 4700 6 times, leaving a remainder of 560.
The next digit of our result is 6. 
Result so far: 19796.27246376
The remainder is 560 after subtracting 4140 from 4700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

The final outcome is 19796.27246376, with a leftover of 5.6e-07.