781375 ÷ 45 
The aim is to understand the frequency of 45 in 781375.

On to step 1:
7 divided by 45 is 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 45

Going ahead to step 2:
When dividing 78 by 45, we get 1 with a remainder of 33.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 45 from 78 to get 33.
Include the next digit (1) from the dividend after 33, then repeat: 331 / 45

Advancing to step 3:
331 divided by 45 is 7 with a remainder of 16.
Use 7 as the next digit of our solution. 
Result so far: 17.0
Subtracting 315 from 331 leaves us with 16.
Append the next digit (3) from the dividend to 16 and continue with: 163 / 45

Going ahead to step 4:
163 divided by 45 is 3 with a remainder of 28.
Put 3 as the next digit of the answer. 
Result so far: 173.0
The remainder is 28 after subtracting 135 from 163.
Include the next digit (7) from the dividend after 28, then repeat: 287 / 45

Going ahead to step 5:
When dividing 287 by 45, we get 6 with a remainder of 17.
Record the quotient 6 as the next digit in the result. 
Result so far: 1736.0
Subtracting 270 from 287 leaves us with 17.
Include the next digit (5) from the dividend after 17, then repeat: 175 / 45

Step 6:
45 goes into 175 3 times with a remainder of 40.
Write down 3 as next digit of the result. 
Result so far: 17363.0
Subtract 135 from 175 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 7:
If we divide 400 by 45, we get 8 and a remainder of 40.
Put 8 as the next digit of the answer. 
Result so far: 17363.8
The remainder is 40 after subtracting 360 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 8:
The number 45 fits into 400 8 times, leaving a remainder of 40.
Put 8 as the next digit of the answer. 
Result so far: 17363.88
Subtract 360 from 400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final outcome is 17363.88, with a leftover of 0.04.