We're dividing 78389661 by 873 
We want to figure out the number of times 78389661 can be divided by 873.

Step 1:
873 can be fit into 7 0 times, resulting in a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 873

Advancing to step 2:
873 can be fit into 78 0 times, resulting in a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 78, we end up with 78.
Fetch the next digit (3) from the dividend, attach it to 78 and continue: 783 / 873

Step 3:
If we divide 783 by 873, we get 0 and a remainder of 783.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 783 leaves us with 783.
Grab the next digit (8) from the dividend, add it to 783, then carry on: 7838 / 873

Step 4:
7838 divided by 873 is 8 with a remainder of 854.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 6984 away from 7838, we end up with 854.
Grab the next digit (9) from the dividend, add it to 854, then carry on: 8549 / 873

Let's proceed to step 5:
If we divide 8549 by 873, we get 9 and a remainder of 692.
The next digit of our result is 9. 
Result so far: 89.0
Subtracting 7857 from 8549 leaves us with 692.
Append the next digit (6) from the dividend to 692 and continue with: 6926 / 873

Going ahead to step 6:
873 goes into 6926 7 times with a remainder of 815.
Put 7 as the next digit of the answer. 
Result so far: 897.0
Deduct 6111 from 6926 and we're left with 815.
Fetch the next digit (6) from the dividend, attach it to 815 and continue: 8156 / 873

On to step 7:
When dividing 8156 by 873, we get 9 with a remainder of 299.
Put 9 as the next digit of the answer. 
Result so far: 8979.0
Subtract 7857 from 8156 to get 299.
Fetch the next digit (1) from the dividend, attach it to 299 and continue: 2991 / 873

Advancing to step 8:
873 can be fit into 2991 3 times, resulting in a remainder of 372.
The number 3 becomes the next digit in our result. 
Result so far: 89793.0
If we subtract 2619 from 2991, we get 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Going ahead to step 9:
When dividing 3720 by 873, we get 4 with a remainder of 228.
Write down 4 as next digit of the result. 
Result so far: 89793.4
If we take 3492 away from 3720, we end up with 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Going ahead to step 10:
873 goes into 2280 2 times with a remainder of 534.
Write down 2 as next digit of the result. 
Result so far: 89793.42
Deduct 1746 from 2280 and we're left with 534.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5340, and continue the process.

Let's proceed to step 11:
873 can be fit into 5340 6 times, resulting in a remainder of 102.
The number 6 becomes the next digit in our result. 
Result so far: 89793.426
Subtracting 5238 from 5340 leaves us with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Step 12:
If we divide 1020 by 873, we get 1 and a remainder of 147.
Record the quotient 1 as the next digit in the result. 
Result so far: 89793.4261
Deduct 873 from 1020 and we're left with 147.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1470, and continue the process.

Let's proceed to step 13:
If we divide 1470 by 873, we get 1 and a remainder of 597.
Write down 1 as next digit of the result. 
Result so far: 89793.42611
If we take 873 away from 1470, we end up with 597.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5970, and continue the process.

After the division, we end up with 89793.42611 and a remainder of 0.000597.