Let's divide 813904 by 45
The aim is to understand the frequency of 45 in 813904.

Moving on to step 1:
The number 45 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 45

Advancing to step 2:
If we divide 81 by 45, we get 1 and a remainder of 36.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 45 from 81 to get 36.
Include the next digit (3) from the dividend after 36, then repeat: 363 / 45

Step 3:
If we divide 363 by 45, we get 8 and a remainder of 3.
Write down 8 as next digit of the result. 
Result so far: 18.0
The remainder is 3 after subtracting 360 from 363.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 45

Step 4:
If we divide 39 by 45, we get 0 and a remainder of 39.
The next digit of our result is 0. 
Result so far: 180.0
Subtracting 0 from 39 leaves us with 39.
Bring next digit (0) of the dividend behind the 39 and repeat the process: 390 / 45

Step 5:
When dividing 390 by 45, we get 8 with a remainder of 30.
The number 8 becomes the next digit in our result. 
Result so far: 1808.0
Subtract 360 from 390 to get 30.
Include the next digit (4) from the dividend after 30, then repeat: 304 / 45

On to step 6:
The number 45 fits into 304 6 times, leaving a remainder of 34.
Record the quotient 6 as the next digit in the result. 
Result so far: 18086.0
The remainder is 34 after subtracting 270 from 304.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 7:
When dividing 340 by 45, we get 7 with a remainder of 25.
Put 7 as the next digit of the answer. 
Result so far: 18086.7
If we subtract 315 from 340, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 8:
45 goes into 250 5 times with a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 18086.75
Subtract 225 from 250 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 9:
250 divided by 45 is 5 with a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 18086.755
Subtract 225 from 250 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The quotient of the division is 18086.755, and the remainder is 0.0025.