We're dividing 78686390 by 85 
We want to figure out the number of times 78686390 can be divided by 85.

Let's proceed to step 1:
7 divided by 85 is 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 85

On to step 2:
78 divided by 85 is 0 with a remainder of 78.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Grab the next digit (6) from the dividend, add it to 78, then carry on: 786 / 85

Advancing to step 3:
The number 85 fits into 786 9 times, leaving a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 9.0
The remainder is 21 after subtracting 765 from 786.
Grab the next digit (8) from the dividend, add it to 21, then carry on: 218 / 85

On to step 4:
When dividing 218 by 85, we get 2 with a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 92.0
If we take 170 away from 218, we end up with 48.
Take the next digit (6) from the dividend and append it to 48, then repeat: 486 / 85

Advancing to step 5:
85 goes into 486 5 times with a remainder of 61.
The next digit of our result is 5. 
Result so far: 925.0
Deduct 425 from 486 and we're left with 61.
Fetch the next digit (3) from the dividend, attach it to 61 and continue: 613 / 85

Step 6:
If we divide 613 by 85, we get 7 and a remainder of 18.
The next digit of our result is 7. 
Result so far: 9257.0
If we subtract 595 from 613, we get 18.
Take the next digit (9) from the dividend and append it to 18, then repeat: 189 / 85

Advancing to step 7:
The number 85 fits into 189 2 times, leaving a remainder of 19.
Write down 2 as next digit of the result. 
Result so far: 92572.0
If we take 170 away from 189, we end up with 19.
Include the next digit (0) from the dividend after 19, then repeat: 190 / 85

Advancing to step 8:
When dividing 190 by 85, we get 2 with a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 925722.0
Subtracting 170 from 190 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 9:
85 goes into 200 2 times with a remainder of 30.
Put 2 as the next digit of the answer. 
Result so far: 925722.2
Subtracting 170 from 200 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 10:
When dividing 300 by 85, we get 3 with a remainder of 45.
Use 3 as the next digit of our solution. 
Result so far: 925722.23
If we take 255 away from 300, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 11:
85 can be fit into 450 5 times, resulting in a remainder of 25.
The next digit of our result is 5. 
Result so far: 925722.235
Subtract 425 from 450 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 12:
The number 85 fits into 250 2 times, leaving a remainder of 80.
The number 2 becomes the next digit in our result. 
Result so far: 925722.2352
If we take 170 away from 250, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 13:
If we divide 800 by 85, we get 9 and a remainder of 35.
Use 9 as the next digit of our solution. 
Result so far: 925722.23529
Deduct 765 from 800 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 14:
85 can be fit into 350 4 times, resulting in a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 925722.235294
Subtract 340 from 350 to 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 15:
The number 85 fits into 100 1 times, leaving a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 925722.2352941
If we subtract 85 from 100, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 16:
When dividing 150 by 85, we get 1 with a remainder of 65.
The next digit of our result is 1. 
Result so far: 925722.23529411
If we subtract 85 from 150, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

The final result is 925722.23529411 with a remainder of 6.5e-08.