Let's divide 78339685 by 858
We want to divide 78339685 by 858.

Step 1:
The number 858 fits into 7 0 times, leaving a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 858

Advancing to step 2:
When dividing 78 by 858, we get 0 with a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Include the next digit (3) from the dividend after 78, then repeat: 783 / 858

Advancing to step 3:
783 divided by 858 is 0 with a remainder of 783.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 783 to get 783.
Take the next digit (3) from the dividend and append it to 783, then repeat: 7833 / 858

Going ahead to step 4:
When dividing 7833 by 858, we get 9 with a remainder of 111.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we subtract 7722 from 7833, we get 111.
Grab the next digit (9) from the dividend, add it to 111, then carry on: 1119 / 858

Going ahead to step 5:
The number 858 fits into 1119 1 times, leaving a remainder of 261.
The number 1 becomes the next digit in our result. 
Result so far: 91.0
Subtracting 858 from 1119 leaves us with 261.
Fetch the next digit (6) from the dividend, attach it to 261 and continue: 2616 / 858

Moving on to step 6:
If we divide 2616 by 858, we get 3 and a remainder of 42.
Write down 3 as next digit of the result. 
Result so far: 913.0
Subtract 2574 from 2616 to get 42.
Grab the next digit (8) from the dividend, add it to 42, then carry on: 428 / 858

On to step 7:
858 goes into 428 0 times with a remainder of 428.
Put 0 as the next digit of the answer. 
Result so far: 9130.0
Deduct 0 from 428 and we're left with 428.
Fetch the next digit (5) from the dividend, attach it to 428 and continue: 4285 / 858

Moving on to step 8:
If we divide 4285 by 858, we get 4 and a remainder of 853.
Record the quotient 4 as the next digit in the result. 
Result so far: 91304.0
Deduct 3432 from 4285 and we're left with 853.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8530, and continue the process.

Step 9:
8530 divided by 858 is 9 with a remainder of 808.
The next digit of our result is 9. 
Result so far: 91304.9
Subtract 7722 from 8530 to get 808.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8080, and continue the process.

On to step 10:
When dividing 8080 by 858, we get 9 with a remainder of 358.
The number 9 becomes the next digit in our result. 
Result so far: 91304.99
The remainder is 358 after subtracting 7722 from 8080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

The final result is 91304.99 with a remainder of 0.358.