18690725 ÷ 665 
The aim is to understand the frequency of 665 in 18690725.

Let's proceed to step 1:
665 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 665

On to step 2:
665 goes into 18 0 times with a remainder of 18.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 18 and we're left with 18.
Grab the next digit (6) from the dividend, add it to 18, then carry on: 186 / 665

Step 3:
186 divided by 665 is 0 with a remainder of 186.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 186 and we're left with 186.
Include the next digit (9) from the dividend after 186, then repeat: 1869 / 665

Step 4:
665 can be fit into 1869 2 times, resulting in a remainder of 539.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 1330 from 1869 leaves us with 539.
Bring next digit (0) of the dividend behind the 539 and repeat the process: 5390 / 665

Moving on to step 5:
5390 divided by 665 is 8 with a remainder of 70.
Write down 8 as next digit of the result. 
Result so far: 28.0
Subtracting 5320 from 5390 leaves us with 70.
Bring next digit (7) of the dividend behind the 70 and repeat the process: 707 / 665

Going ahead to step 6:
665 can be fit into 707 1 times, resulting in a remainder of 42.
Record the quotient 1 as the next digit in the result. 
Result so far: 281.0
The remainder is 42 after subtracting 665 from 707.
Fetch the next digit (2) from the dividend, attach it to 42 and continue: 422 / 665

Advancing to step 7:
If we divide 422 by 665, we get 0 and a remainder of 422.
Record the quotient 0 as the next digit in the result. 
Result so far: 2810.0
If we take 0 away from 422, we end up with 422.
Include the next digit (5) from the dividend after 422, then repeat: 4225 / 665

Step 8:
665 can be fit into 4225 6 times, resulting in a remainder of 235.
The number 6 becomes the next digit in our result. 
Result so far: 28106.0
Subtract 3990 from 4225 to get 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Advancing to step 9:
The number 665 fits into 2350 3 times, leaving a remainder of 355.
Use 3 as the next digit of our solution. 
Result so far: 28106.3
If we take 1995 away from 2350, we end up with 355.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3550, and continue the process.

Let's proceed to step 10:
When dividing 3550 by 665, we get 5 with a remainder of 225.
The number 5 becomes the next digit in our result. 
Result so far: 28106.35
Subtracting 3325 from 3550 leaves us with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

On to step 11:
2250 divided by 665 is 3 with a remainder of 255.
The next digit of our result is 3. 
Result so far: 28106.353
Deduct 1995 from 2250 and we're left with 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

Advancing to step 12:
665 goes into 2550 3 times with a remainder of 555.
Use 3 as the next digit of our solution. 
Result so far: 28106.3533
If we take 1995 away from 2550, we end up with 555.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5550, and continue the process.

The final result is 28106.3533 with a remainder of 0.00555.