We're dividing 20985 by 78 
We want to divide 20985 by 78.

Step 1:
78 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 78

Let's proceed to step 2:
The number 78 fits into 20 0 times, leaving a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 20, we end up with 20.
Include the next digit (9) from the dividend after 20, then repeat: 209 / 78

Let's proceed to step 3:
78 goes into 209 2 times with a remainder of 53.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 156 from 209 to get 53.
Take the next digit (8) from the dividend and append it to 53, then repeat: 538 / 78

On to step 4:
78 can be fit into 538 6 times, resulting in a remainder of 70.
Record the quotient 6 as the next digit in the result. 
Result so far: 26.0
The remainder is 70 after subtracting 468 from 538.
Grab the next digit (5) from the dividend, add it to 70, then carry on: 705 / 78

Step 5:
The number 78 fits into 705 9 times, leaving a remainder of 3.
Write down 9 as next digit of the result. 
Result so far: 269.0
Deduct 702 from 705 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 6:
If we divide 30 by 78, we get 0 and a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 269.0
If we take 0 away from 30, we end up 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.

Going ahead to step 7:
300 divided by 78 is 3 with a remainder of 66.
Put 3 as the next digit of the answer. 
Result so far: 269.03
Subtract 234 from 300 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 8:
78 goes into 660 8 times with a remainder of 36.
The next digit of our result is 8. 
Result so far: 269.038
If we take 624 away from 660, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 9:
78 goes into 360 4 times with a remainder of 48.
Record the quotient 4 as the next digit in the result. 
Result so far: 269.0384
Subtracting 312 from 360 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 10:
When dividing 480 by 78, we get 6 with a remainder of 12.
The next digit of our result is 6. 
Result so far: 269.03846
If we take 468 away from 480, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 11:
120 divided by 78 is 1 with a remainder of 42.
Record the quotient 1 as the next digit in the result. 
Result so far: 269.038461
Subtract 78 from 120 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 12:
The number 78 fits into 420 5 times, leaving a remainder of 30.
Use 5 as the next digit of our solution. 
Result so far: 269.0384615
Subtracting 390 from 420 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.

Going ahead to step 13:
The number 78 fits into 300 3 times, leaving a remainder of 66.
Write down 3 as next digit of the result. 
Result so far: 269.03846153
Deduct 234 from 300 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

The final outcome is 269.03846153, with a leftover of 6.6e-08.