We look at the division of 754745 by 45 
The aim is to understand the frequency of 45 in 754745.

Step 1:
7 divided by 45 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Fetch the next digit (5) from the dividend, attach it to 7 and continue: 75 / 45

Advancing to step 2:
75 divided by 45 is 1 with a remainder of 30.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 45 from 75 and we're left with 30.
Include the next digit (4) from the dividend after 30, then repeat: 304 / 45

Step 3:
If we divide 304 by 45, we get 6 and a remainder of 34.
Use 6 as the next digit of our solution. 
Result so far: 16.0
If we subtract 270 from 304, we get 34.
Fetch the next digit (7) from the dividend, attach it to 34 and continue: 347 / 45

Step 4:
If we divide 347 by 45, we get 7 and a remainder of 32.
Record the quotient 7 as the next digit in the result. 
Result so far: 167.0
Deduct 315 from 347 and we're left with 32.
Fetch the next digit (4) from the dividend, attach it to 32 and continue: 324 / 45

Let's proceed to step 5:
If we divide 324 by 45, we get 7 and a remainder of 9.
Record the quotient 7 as the next digit in the result. 
Result so far: 1677.0
If we take 315 away from 324, we end up with 9.
Fetch the next digit (5) from the dividend, attach it to 9 and continue: 95 / 45

Advancing to step 6:
The number 45 fits into 95 2 times, leaving a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 16772.0
Subtracting 90 from 95 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 7:
45 goes into 50 1 times with a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 16772.1
Deduct 45 from 50 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 8:
If we divide 50 by 45, we get 1 and a remainder of 5.
The next digit of our result is 1. 
Result so far: 16772.11
The remainder is 5 after subtracting 45 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 16772.11, with a leftover of 0.005.