We look at the division of 858709 by 45 
We're looking to find how many times 45 goes into 858709.

Let's proceed to step 1:
The number 45 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 45

Let's proceed to step 2:
The number 45 fits into 85 1 times, leaving a remainder of 40.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 45 away from 85, we end up with 40.
Take the next digit (8) from the dividend and append it to 40, then repeat: 408 / 45

Let's proceed to step 3:
The number 45 fits into 408 9 times, leaving a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtracting 405 from 408 leaves us with 3.
Bring next digit (7) of the dividend behind the 3 and repeat the process: 37 / 45

Going ahead to step 4:
45 can be fit into 37 0 times, resulting in a remainder of 37.
Put 0 as the next digit of the answer. 
Result so far: 190.0
Subtracting 0 from 37 leaves us with 37.
Bring next digit (0) of the dividend behind the 37 and repeat the process: 370 / 45

On to step 5:
When dividing 370 by 45, we get 8 with a remainder of 10.
Put 8 as the next digit of the answer. 
Result so far: 1908.0
Subtracting 360 from 370 leaves us with 10.
Append the next digit (9) from the dividend to 10 and continue with: 109 / 45

Going ahead to step 6:
When dividing 109 by 45, we get 2 with a remainder of 19.
Write down 2 as next digit of the result. 
Result so far: 19082.0
If we take 90 away from 109, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 7:
If we divide 190 by 45, we get 4 and a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 19082.4
If we subtract 180 from 190, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
100 divided by 45 is 2 with a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 19082.42
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
45 can be fit into 100 2 times, resulting in a remainder of 10.
The next digit of our result is 2. 
Result so far: 19082.422
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 19082.422 with a remainder of 0.001.