353172 divided by 45 
The aim is to understand the frequency of 45 in 353172.

Advancing to step 1:
When dividing 3 by 45, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 45

On to step 2:
If we divide 35 by 45, we get 0 and a remainder of 35.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 35 and we're left with 35.
Grab the next digit (3) from the dividend, add it to 35, then carry on: 353 / 45

Step 3:
If we divide 353 by 45, we get 7 and a remainder of 38.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we subtract 315 from 353, we get 38.
Bring next digit (1) of the dividend behind the 38 and repeat the process: 381 / 45

On to step 4:
If we divide 381 by 45, we get 8 and a remainder of 21.
The number 8 becomes the next digit in our result. 
Result so far: 78.0
If we subtract 360 from 381, we get 21.
Fetch the next digit (7) from the dividend, attach it to 21 and continue: 217 / 45

Going ahead to step 5:
When dividing 217 by 45, we get 4 with a remainder of 37.
Use 4 as the next digit of our solution. 
Result so far: 784.0
Subtract 180 from 217 to get 37.
Include the next digit (2) from the dividend after 37, then repeat: 372 / 45

Let's proceed to step 6:
The number 45 fits into 372 8 times, leaving a remainder of 12.
The next digit of our result is 8. 
Result so far: 7848.0
If we subtract 360 from 372, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 7:
When dividing 120 by 45, we get 2 with a remainder of 30.
The next digit of our result is 2. 
Result so far: 7848.2
If we subtract 90 from 120, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
The number 45 fits into 300 6 times, leaving a remainder of 30.
Record the quotient 6 as the next digit in the result. 
Result so far: 7848.26
If we subtract 270 from 300, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
45 can be fit into 300 6 times, resulting in a remainder of 30.
The number 6 becomes the next digit in our result. 
Result so far: 7848.266
Subtracting 270 from 300 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

After the division, we end up with 7848.266 and a remainder of 0.003.