209987 ÷ 12 
We want to divide 209987 by 12.

Advancing to step 1:
The number 12 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 12

On to step 2:
If we divide 20 by 12, we get 1 and a remainder of 8.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 8 after subtracting 12 from 20.
Take the next digit (9) from the dividend and append it to 8, then repeat: 89 / 12

Advancing to step 3:
89 divided by 12 is 7 with a remainder of 5.
Put 7 as the next digit of the answer. 
Result so far: 17.0
If we take 84 away from 89, we end up with 5.
Take the next digit (9) from the dividend and append it to 5, then repeat: 59 / 12

On to step 4:
12 can be fit into 59 4 times, resulting in a remainder of 11.
Write down 4 as next digit of the result. 
Result so far: 174.0
If we subtract 48 from 59, we get 11.
Grab the next digit (8) from the dividend, add it to 11, then carry on: 118 / 12

Going ahead to step 5:
If we divide 118 by 12, we get 9 and a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 1749.0
If we take 108 away from 118, we end up with 10.
Take the next digit (7) from the dividend and append it to 10, then repeat: 107 / 12

Advancing to step 6:
If we divide 107 by 12, we get 8 and a remainder of 11.
The next digit of our result is 8. 
Result so far: 17498.0
Subtract 96 from 107 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
When dividing 110 by 12, we get 9 with a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 17498.9
If we subtract 108 from 110, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
When dividing 20 by 12, we get 1 with a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 17498.91
Subtract 12 from 20 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
The number 12 fits into 80 6 times, leaving a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 17498.916
Deduct 72 from 80 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
The number 12 fits into 80 6 times, leaving a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 17498.9166
If we subtract 72 from 80, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

After the division, we end up with 17498.9166 and a remainder of 8e-05.