We look at the division of 645203 by 45 
The aim is to understand the frequency of 45 in 645203.

Step 1:
If we divide 6 by 45, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 45

Going ahead to step 2:
If we divide 64 by 45, we get 1 and a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 45 away from 64, we end up with 19.
Bring next digit (5) of the dividend behind the 19 and repeat the process: 195 / 45

Going ahead to step 3:
45 can be fit into 195 4 times, resulting in a remainder of 15.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
If we take 180 away from 195, we end up with 15.
Fetch the next digit (2) from the dividend, attach it to 15 and continue: 152 / 45

Going ahead to step 4:
45 goes into 152 3 times with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 143.0
Subtracting 135 from 152 leaves us with 17.
Fetch the next digit (0) from the dividend, attach it to 17 and continue: 170 / 45

Let's proceed to step 5:
When dividing 170 by 45, we get 3 with a remainder of 35.
Use 3 as the next digit of our solution. 
Result so far: 1433.0
Subtracting 135 from 170 leaves us with 35.
Take the next digit (3) from the dividend and append it to 35, then repeat: 353 / 45

Step 6:
The number 45 fits into 353 7 times, leaving a remainder of 38.
Record the quotient 7 as the next digit in the result. 
Result so far: 14337.0
Subtracting 315 from 353 leaves us 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.

Moving on to step 7:
45 goes into 380 8 times with a remainder of 20.
Write down 8 as next digit of the result. 
Result so far: 14337.8
If we subtract 360 from 380, we get 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 8:
If we divide 200 by 45, we get 4 and a remainder of 20.
Put 4 as the next digit of the answer. 
Result so far: 14337.84
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
45 can be fit into 200 4 times, resulting in a remainder of 20.
Put 4 as the next digit of the answer. 
Result so far: 14337.844
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

In conclusion, the division gives 14337.844 with a balance of 0.002.