19802310 ÷ 45 
The aim is to understand the frequency of 45 in 19802310.

Step 1:
When dividing 1 by 45, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 45

Moving on to step 2:
19 divided by 45 is 0 with a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 19 after subtracting 0 from 19.
Append the next digit (8) from the dividend to 19 and continue with: 198 / 45

Moving on to step 3:
198 divided by 45 is 4 with a remainder of 18.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 180 from 198 leaves us with 18.
Include the next digit (0) from the dividend after 18, then repeat: 180 / 45

Step 4:
45 can be fit into 180 4 times, resulting in a remainder of 0.
The next digit of our result is 4. 
Result so far: 44.0
Subtract 180 from 180 to get 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 45

Step 5:
45 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 440.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (3) from the dividend after 2, then repeat: 23 / 45

Going ahead to step 6:
When dividing 23 by 45, we get 0 with a remainder of 23.
The number 0 becomes the next digit in our result. 
Result so far: 4400.0
Subtract 0 from 23 to get 23.
Append the next digit (1) from the dividend to 23 and continue with: 231 / 45

Let's proceed to step 7:
The number 45 fits into 231 5 times, leaving a remainder of 6.
Record the quotient 5 as the next digit in the result. 
Result so far: 44005.0
Subtracting 225 from 231 leaves us with 6.
Include the next digit (0) from the dividend after 6, then repeat: 60 / 45

Going ahead to step 8:
45 can be fit into 60 1 times, resulting in a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 440051.0
Deduct 45 from 60 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 9:
45 can be fit into 150 3 times, resulting in a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 440051.3
If we take 135 away from 150, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 10:
When dividing 150 by 45, we get 3 with a remainder of 15.
The next digit of our result is 3. 
Result so far: 440051.33
Subtract 135 from 150 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Our division results in 440051.33 with a remaining 0.015.