We're dividing 78699 by 51 
We're looking to find how many times 51 goes into 78699.

Moving on to step 1:
51 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 51

On to step 2:
78 divided by 51 is 1 with a remainder of 27.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 51 from 78, we get 27.
Fetch the next digit (6) from the dividend, attach it to 27 and continue: 276 / 51

Going ahead to step 3:
If we divide 276 by 51, we get 5 and a remainder of 21.
The next digit of our result is 5. 
Result so far: 15.0
Deduct 255 from 276 and we're left with 21.
Take the next digit (9) from the dividend and append it to 21, then repeat: 219 / 51

Let's proceed to step 4:
51 can be fit into 219 4 times, resulting in a remainder of 15.
The number 4 becomes the next digit in our result. 
Result so far: 154.0
If we take 204 away from 219, we end up with 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 51

On to step 5:
51 can be fit into 159 3 times, resulting in a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 1543.0
If we subtract 153 from 159, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 6:
60 divided by 51 is 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1543.1
The remainder is 9 after subtracting 51 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 7:
When dividing 90 by 51, we get 1 with a remainder of 39.
The number 1 becomes the next digit in our result. 
Result so far: 1543.11
If we take 51 away from 90, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The final result is 1543.11 with a remainder of 0.039.