We're dividing 909843 by 45 
The aim is to understand the frequency of 45 in 909843.

Moving on to step 1:
9 divided by 45 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 45

Let's proceed to step 2:
When dividing 90 by 45, we get 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 90 from 90 and we're left with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 45

On to step 3:
45 can be fit into 9 0 times, resulting in a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 20.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 45

Going ahead to step 4:
98 divided by 45 is 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 202.0
Subtract 90 from 98 to get 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 45

Moving on to step 5:
84 divided by 45 is 1 with a remainder of 39.
The next digit of our result is 1. 
Result so far: 2021.0
Subtracting 45 from 84 leaves us with 39.
Include the next digit (3) from the dividend after 39, then repeat: 393 / 45

Going ahead to step 6:
The number 45 fits into 393 8 times, leaving a remainder of 33.
The next digit of our result is 8. 
Result so far: 20218.0
The remainder is 33 after subtracting 360 from 393.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 7:
When dividing 330 by 45, we get 7 with a remainder of 15.
The number 7 becomes the next digit in our result. 
Result so far: 20218.7
The remainder is 15 after subtracting 315 from 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 8:
The number 45 fits into 150 3 times, leaving a remainder of 15.
Record the quotient 3 as the next digit in the result. 
Result so far: 20218.73
The remainder is 15 after subtracting 135 from 150.
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 9:
The number 45 fits into 150 3 times, leaving a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 20218.733
If we subtract 135 from 150, we 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.

The quotient of the division is 20218.733, and the remainder is 0.0015.