We look at the division of 858640 by 10 
We want to figure out the number of times 858640 can be divided by 10.

Moving on to step 1:
10 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 10

Going ahead to step 2:
10 can be fit into 85 8 times, resulting in a remainder of 5.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
The remainder is 5 after subtracting 80 from 85.
Take the next digit (8) from the dividend and append it to 5, then repeat: 58 / 10

On to step 3:
10 can be fit into 58 5 times, resulting in a remainder of 8.
Use 5 as the next digit of our solution. 
Result so far: 85.0
If we take 50 away from 58, we end up with 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 10

Going ahead to step 4:
When dividing 86 by 10, we get 8 with a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 858.0
If we subtract 80 from 86, we get 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 10

Going ahead to step 5:
10 goes into 64 6 times with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 8586.0
If we take 60 away from 64, we end up with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 10

Let's proceed to step 6:
40 divided by 10 is 4 with a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 85864.0
If we subtract 40 from 40, we 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.

Advancing to step 7:
10 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 85864.0
Deduct 0 from 0 and we're left 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.

Let's proceed to step 8:
10 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 85864.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 85864.0, with a leftover of 0.0.