We're dividing 77712399 by 858 
Our goal is to divide 77712399 by 858.

Going ahead to step 1:
When dividing 7 by 858, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Include the next digit (7) from the dividend after 7, then repeat: 77 / 858

Advancing to step 2:
When dividing 77 by 858, we get 0 with a remainder of 77.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 77 to get 77.
Take the next digit (7) from the dividend and append it to 77, then repeat: 777 / 858

Advancing to step 3:
The number 858 fits into 777 0 times, leaving a remainder of 777.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 777 leaves us with 777.
Include the next digit (1) from the dividend after 777, then repeat: 7771 / 858

On to step 4:
The number 858 fits into 7771 9 times, leaving a remainder of 49.
The next digit of our result is 9. 
Result so far: 9.0
If we subtract 7722 from 7771, we get 49.
Fetch the next digit (2) from the dividend, attach it to 49 and continue: 492 / 858

Step 5:
If we divide 492 by 858, we get 0 and a remainder of 492.
Use 0 as the next digit of our solution. 
Result so far: 90.0
The remainder is 492 after subtracting 0 from 492.
Bring next digit (3) of the dividend behind the 492 and repeat the process: 4923 / 858

Moving on to step 6:
858 goes into 4923 5 times with a remainder of 633.
The next digit of our result is 5. 
Result so far: 905.0
Subtract 4290 from 4923 to get 633.
Append the next digit (9) from the dividend to 633 and continue with: 6339 / 858

Moving on to step 7:
The number 858 fits into 6339 7 times, leaving a remainder of 333.
Use 7 as the next digit of our solution. 
Result so far: 9057.0
Deduct 6006 from 6339 and we're left with 333.
Append the next digit (9) from the dividend to 333 and continue with: 3339 / 858

On to step 8:
If we divide 3339 by 858, we get 3 and a remainder of 765.
Use 3 as the next digit of our solution. 
Result so far: 90573.0
The remainder is 765 after subtracting 2574 from 3339.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7650, and continue the process.

Step 9:
The number 858 fits into 7650 8 times, leaving a remainder of 786.
Record the quotient 8 as the next digit in the result. 
Result so far: 90573.8
If we subtract 6864 from 7650, we get 786.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7860, and continue the process.

Going ahead to step 10:
When dividing 7860 by 858, we get 9 with a remainder of 138.
Use 9 as the next digit of our solution. 
Result so far: 90573.89
Deduct 7722 from 7860 and we're left with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Moving on to step 11:
When dividing 1380 by 858, we get 1 with a remainder of 522.
Put 1 as the next digit of the answer. 
Result so far: 90573.891
Deduct 858 from 1380 and we're left with 522.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5220, and continue the process.

Let's proceed to step 12:
If we divide 5220 by 858, we get 6 and a remainder of 72.
Write down 6 as next digit of the result. 
Result so far: 90573.8916
Deduct 5148 from 5220 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 13:
858 can be fit into 720 0 times, resulting in a remainder of 720.
The number 0 becomes the next digit in our result. 
Result so far: 90573.8916
If we subtract 0 from 720, we get 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7200, and continue the process.

Step 14:
858 can be fit into 7200 8 times, resulting in a remainder of 336.
Record the quotient 8 as the next digit in the result. 
Result so far: 90573.891608
Deduct 6864 from 7200 and we're left with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Advancing to step 15:
When dividing 3360 by 858, we get 3 with a remainder of 786.
Record the quotient 3 as the next digit in the result. 
Result so far: 90573.8916083
Deduct 2574 from 3360 and we're left with 786.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7860, and continue the process.

Moving on to step 16:
858 can be fit into 7860 9 times, resulting in a remainder of 138.
Record the quotient 9 as the next digit in the result. 
Result so far: 90573.89160839
Subtracting 7722 from 7860 leaves us with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Our division results in 90573.89160839 with a remaining 1.38e-07.