868844 ÷ 45 
The aim is to understand the frequency of 45 in 868844.

Step 1:
If we divide 8 by 45, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 45

Let's proceed to step 2:
When dividing 86 by 45, we get 1 with a remainder of 41.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 45 from 86 leaves us with 41.
Fetch the next digit (8) from the dividend, attach it to 41 and continue: 418 / 45

Moving on to step 3:
If we divide 418 by 45, we get 9 and a remainder of 13.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtracting 405 from 418 leaves us with 13.
Bring next digit (8) of the dividend behind the 13 and repeat the process: 138 / 45

Let's proceed to step 4:
If we divide 138 by 45, we get 3 and a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 193.0
If we subtract 135 from 138, we get 3.
Append the next digit (4) from the dividend to 3 and continue with: 34 / 45

Step 5:
The number 45 fits into 34 0 times, leaving a remainder of 34.
Put 0 as the next digit of the answer. 
Result so far: 1930.0
Deduct 0 from 34 and we're left with 34.
Take the next digit (4) from the dividend and append it to 34, then repeat: 344 / 45

Moving on to step 6:
If we divide 344 by 45, we get 7 and a remainder of 29.
The next digit of our result is 7. 
Result so far: 19307.0
Deduct 315 from 344 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Advancing to step 7:
290 divided by 45 is 6 with a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 19307.6
If we take 270 away from 290, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
45 can be fit into 200 4 times, resulting in a remainder of 20.
Use 4 as the next digit of our solution. 
Result so far: 19307.64
Subtracting 180 from 200 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 9:
The number 45 fits into 200 4 times, leaving a remainder of 20.
The number 4 becomes the next digit in our result. 
Result so far: 19307.644
Subtracting 180 from 200 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

After the division, we end up with 19307.644 and a remainder of 0.002.