We look at the division of 763566 by 45 
The aim is to understand the frequency of 45 in 763566.

Step 1:
45 can be fit into 7 0 times, resulting in a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (6) from the dividend and append it to 7, then repeat: 76 / 45

Let's proceed to step 2:
45 goes into 76 1 times with a remainder of 31.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 31 after subtracting 45 from 76.
Grab the next digit (3) from the dividend, add it to 31, then carry on: 313 / 45

Let's proceed to step 3:
45 can be fit into 313 6 times, resulting in a remainder of 43.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
Subtract 270 from 313 to get 43.
Fetch the next digit (5) from the dividend, attach it to 43 and continue: 435 / 45

Advancing to step 4:
When dividing 435 by 45, we get 9 with a remainder of 30.
The number 9 becomes the next digit in our result. 
Result so far: 169.0
Subtracting 405 from 435 leaves us with 30.
Bring next digit (6) of the dividend behind the 30 and repeat the process: 306 / 45

Moving on to step 5:
When dividing 306 by 45, we get 6 with a remainder of 36.
Put 6 as the next digit of the answer. 
Result so far: 1696.0
If we take 270 away from 306, we end up with 36.
Bring next digit (6) of the dividend behind the 36 and repeat the process: 366 / 45

Advancing to step 6:
If we divide 366 by 45, we get 8 and a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 16968.0
If we take 360 away from 366, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 7:
If we divide 60 by 45, we get 1 and a remainder of 15.
Write down 1 as next digit of the result. 
Result so far: 16968.1
The remainder is 15 after subtracting 45 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 8:
45 can be fit into 150 3 times, resulting in a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 16968.13
Deduct 135 from 150 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 9:
If we divide 150 by 45, we get 3 and a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 16968.133
If we subtract 135 from 150, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final outcome is 16968.133, with a leftover of 0.0015.