990518 ÷ 45 
The aim is to understand the frequency of 45 in 990518.

On to step 1:
The number 45 fits into 9 0 times, leaving a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 45

Step 2:
The number 45 fits into 99 2 times, leaving a remainder of 9.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 90 away from 99, we end up with 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 45

Let's proceed to step 3:
45 can be fit into 90 2 times, resulting in a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 22.0
Subtracting 90 from 90 leaves us with 0.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 45

Going ahead to step 4:
If we divide 5 by 45, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 220.0
Subtract 0 from 5 to get 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 45

Let's proceed to step 5:
45 goes into 51 1 times with a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 2201.0
If we take 45 away from 51, we end up with 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 45

On to step 6:
The number 45 fits into 68 1 times, leaving a remainder of 23.
Record the quotient 1 as the next digit in the result. 
Result so far: 22011.0
If we take 45 away from 68, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 7:
If we divide 230 by 45, we get 5 and a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 22011.5
Deduct 225 from 230 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 8:
50 divided by 45 is 1 with a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 22011.51
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 9:
When dividing 50 by 45, we get 1 with a remainder of 5.
The next digit of our result is 1. 
Result so far: 22011.511
Subtract 45 from 50 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

After the division, we end up with 22011.511 and a remainder of 0.0005.