858378 ÷ 8 
We want to figure out the number of times 858378 can be divided by 8.

Advancing to step 1:
8 goes into 8 1 times with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 0 after subtracting 8 from 8.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 8

On to step 2:
When dividing 5 by 8, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (8) from the dividend, attach it to 5 and continue: 58 / 8

On to step 3:
8 can be fit into 58 7 times, resulting in a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 107.0
Subtract 56 from 58 to get 2.
Take the next digit (3) from the dividend and append it to 2, then repeat: 23 / 8

Let's proceed to step 4:
The number 8 fits into 23 2 times, leaving a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 1072.0
Subtract 16 from 23 to get 7.
Fetch the next digit (7) from the dividend, attach it to 7 and continue: 77 / 8

Step 5:
77 divided by 8 is 9 with a remainder of 5.
Put 9 as the next digit of the answer. 
Result so far: 10729.0
Subtracting 72 from 77 leaves us with 5.
Take the next digit (8) from the dividend and append it to 5, then repeat: 58 / 8

Step 6:
The number 8 fits into 58 7 times, leaving a remainder of 2.
The next digit of our result is 7. 
Result so far: 107297.0
If we take 56 away from 58, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
20 divided by 8 is 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 107297.2
If we take 16 away from 20, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 8:
8 goes into 40 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 107297.25
Deduct 40 from 40 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.

On to step 9:
When dividing 0 by 8, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 107297.25
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.

Step 10:
0 divided by 8 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 107297.25
If we subtract 0 from 0, 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.

The final outcome is 107297.25, with a leftover of 0.0.