Let's divide 21086 by 78
We want to divide 21086 by 78.

Moving on to step 1:
78 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 78

Going ahead to step 2:
21 divided by 78 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Fetch the next digit (0) from the dividend, attach it to 21 and continue: 210 / 78

Going ahead to step 3:
When dividing 210 by 78, we get 2 with a remainder of 54.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 156 from 210 leaves us with 54.
Append the next digit (8) from the dividend to 54 and continue with: 548 / 78

Let's proceed to step 4:
78 can be fit into 548 7 times, resulting in a remainder of 2.
The next digit of our result is 7. 
Result so far: 27.0
If we take 546 away from 548, we end up with 2.
Take the next digit (6) from the dividend and append it to 2, then repeat: 26 / 78

Moving on to step 5:
When dividing 26 by 78, we get 0 with a remainder of 26.
The number 0 becomes the next digit in our result. 
Result so far: 270.0
The remainder is 26 after subtracting 0 from 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 6:
260 divided by 78 is 3 with a remainder of 26.
Record the quotient 3 as the next digit in the result. 
Result so far: 270.3
If we subtract 234 from 260, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 7:
78 can be fit into 260 3 times, resulting in a remainder of 26.
The next digit of our result is 3. 
Result so far: 270.33
If we take 234 away from 260, we end up with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

After the division, we end up with 270.33 and a remainder of 0.026.