810651 ÷ 45 
The aim is to understand the frequency of 45 in 810651.

On to step 1:
45 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 45

Advancing to step 2:
81 divided by 45 is 1 with 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.
Take the next digit (0) from the dividend and append it to 36, then repeat: 360 / 45

Advancing to step 3:
45 goes into 360 8 times with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
If we take 360 away from 360, we end up with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 45

Advancing to step 4:
6 divided by 45 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 180.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 45

On to step 5:
If we divide 65 by 45, we get 1 and a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 1801.0
If we subtract 45 from 65, we get 20.
Take the next digit (1) from the dividend and append it to 20, then repeat: 201 / 45

Step 6:
When dividing 201 by 45, we get 4 with a remainder of 21.
The next digit of our result is 4. 
Result so far: 18014.0
Subtract 180 from 201 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 7:
When dividing 210 by 45, we get 4 with a remainder of 30.
Use 4 as the next digit of our solution. 
Result so far: 18014.4
The remainder is 30 after subtracting 180 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 8:
300 divided by 45 is 6 with a remainder of 30.
Put 6 as the next digit of the answer. 
Result so far: 18014.46
If we subtract 270 from 300, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 9:
300 divided by 45 is 6 with a remainder of 30.
The number 6 becomes the next digit in our result. 
Result so far: 18014.466
Deduct 270 from 300 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The quotient of the division is 18014.466, and the remainder is 0.003.