We look at the division of 443783 by 45 
The aim is to understand the frequency of 45 in 443783.

On to step 1:
When dividing 4 by 45, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 45

On to step 2:
45 can be fit into 44 0 times, resulting in a remainder of 44.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 44 after subtracting 0 from 44.
Grab the next digit (3) from the dividend, add it to 44, then carry on: 443 / 45

On to step 3:
When dividing 443 by 45, we get 9 with a remainder of 38.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Deduct 405 from 443 and we're left with 38.
Append the next digit (7) from the dividend to 38 and continue with: 387 / 45

Moving on to step 4:
45 can be fit into 387 8 times, resulting in a remainder of 27.
The next digit of our result is 8. 
Result so far: 98.0
The remainder is 27 after subtracting 360 from 387.
Take the next digit (8) from the dividend and append it to 27, then repeat: 278 / 45

Going ahead to step 5:
The number 45 fits into 278 6 times, leaving a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 986.0
If we take 270 away from 278, we end up with 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 45

Moving on to step 6:
The number 45 fits into 83 1 times, leaving a remainder of 38.
Record the quotient 1 as the next digit in the result. 
Result so far: 9861.0
Deduct 45 from 83 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 7:
The number 45 fits into 380 8 times, leaving a remainder of 20.
The number 8 becomes the next digit in our result. 
Result so far: 9861.8
The remainder is 20 after subtracting 360 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
The number 45 fits into 200 4 times, leaving a remainder of 20.
Put 4 as the next digit of the answer. 
Result so far: 9861.84
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.

On to step 9:
45 can be fit into 200 4 times, resulting in a remainder of 20.
The next digit of our result is 4. 
Result so far: 9861.844
If we take 180 away from 200, 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.

The final outcome is 9861.844, with a leftover of 0.002.