We look at the division of 839970 by 45 
We want to figure out the number of times 839970 can be divided by 45.

Advancing to step 1:
When dividing 8 by 45, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 45

Going ahead to step 2:
45 can be fit into 83 1 times, resulting in a remainder of 38.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 45 from 83 to get 38.
Include the next digit (9) from the dividend after 38, then repeat: 389 / 45

Going ahead to step 3:
The number 45 fits into 389 8 times, leaving a remainder of 29.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
The remainder is 29 after subtracting 360 from 389.
Fetch the next digit (9) from the dividend, attach it to 29 and continue: 299 / 45

Moving on to step 4:
299 divided by 45 is 6 with a remainder of 29.
Put 6 as the next digit of the answer. 
Result so far: 186.0
If we take 270 away from 299, we end up with 29.
Take the next digit (7) from the dividend and append it to 29, then repeat: 297 / 45

Moving on to step 5:
If we divide 297 by 45, we get 6 and a remainder of 27.
The number 6 becomes the next digit in our result. 
Result so far: 1866.0
Subtract 270 from 297 to get 27.
Append the next digit (0) from the dividend to 27 and continue with: 270 / 45

Going ahead to step 6:
270 divided by 45 is 6 with a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 18666.0
Subtracting 270 from 270 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 7:
If we divide 0 by 45, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 18666.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
0 divided by 45 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 18666.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 18666.0 and a remainder of 0.0.