We're dividing 173570 by 45 
We want to figure out the number of times 173570 can be divided by 45.

Step 1:
If we divide 1 by 45, we get 0 and a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (7) from the dividend and append it to 1, then repeat: 17 / 45

On to step 2:
45 goes into 17 0 times with a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Append the next digit (3) from the dividend to 17 and continue with: 173 / 45

Step 3:
If we divide 173 by 45, we get 3 and a remainder of 38.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 135 from 173 and we're left with 38.
Grab the next digit (5) from the dividend, add it to 38, then carry on: 385 / 45

Advancing to step 4:
The number 45 fits into 385 8 times, leaving a remainder of 25.
Write down 8 as next digit of the result. 
Result so far: 38.0
The remainder is 25 after subtracting 360 from 385.
Bring next digit (7) of the dividend behind the 25 and repeat the process: 257 / 45

Let's proceed to step 5:
45 goes into 257 5 times with a remainder of 32.
Put 5 as the next digit of the answer. 
Result so far: 385.0
Deduct 225 from 257 and we're left with 32.
Grab the next digit (0) from the dividend, add it to 32, then carry on: 320 / 45

On to step 6:
45 goes into 320 7 times with a remainder of 5.
The number 7 becomes the next digit in our result. 
Result so far: 3857.0
Deduct 315 from 320 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 7:
If we divide 50 by 45, we get 1 and a remainder of 5.
Write down 1 as next digit of the result. 
Result so far: 3857.1
If we take 45 away from 50, we end up 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.

Advancing to step 8:
45 can be fit into 50 1 times, resulting in a remainder of 5.
Write down 1 as next digit of the result. 
Result so far: 3857.11
If we subtract 45 from 50, we get 5.
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 3857.11, with a leftover of 0.005.