We look at the division of 450091 by 45 
The aim is to understand the frequency of 45 in 450091.

Let's proceed to step 1:
The number 45 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 45

Advancing to step 2:
45 divided by 45 is 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 0 after subtracting 45 from 45.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 45

Going ahead to step 3:
45 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 0 to get 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 45

Advancing to step 4:
45 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 100.0
If we take 0 away from 0, we end up with 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 45

Going ahead to step 5:
9 divided by 45 is 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 1000.0
Subtracting 0 from 9 leaves us with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 45

Going ahead to step 6:
45 goes into 91 2 times with a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 10002.0
If we subtract 90 from 91, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
If we divide 10 by 45, we get 0 and a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 10002.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
100 divided by 45 is 2 with a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 10002.02
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
100 divided by 45 is 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 10002.022
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The quotient of the division is 10002.022, and the remainder is 0.001.