261818 ÷ 12 
We want to figure out the number of times 261818 can be divided by 12.

Advancing to step 1:
If we divide 2 by 12, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 12

Step 2:
The number 12 fits into 26 2 times, leaving a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 2 after subtracting 24 from 26.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 12

On to step 3:
If we divide 21 by 12, we get 1 and a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 21.0
If we subtract 12 from 21, we get 9.
Include the next digit (8) from the dividend after 9, then repeat: 98 / 12

Moving on to step 4:
The number 12 fits into 98 8 times, leaving a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 218.0
Deduct 96 from 98 and we're left with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 12

Step 5:
The number 12 fits into 21 1 times, leaving a remainder of 9.
The next digit of our result is 1. 
Result so far: 2181.0
If we subtract 12 from 21, we get 9.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 12

Advancing to step 6:
When dividing 98 by 12, we get 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 21818.0
Subtract 96 from 98 to 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.

Advancing to step 7:
20 divided by 12 is 1 with a remainder of 8.
The next digit of our result is 1. 
Result so far: 21818.1
If we subtract 12 from 20, 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.

Moving on to step 8:
12 goes into 80 6 times with a remainder of 8.
The next digit of our result is 6. 
Result so far: 21818.16
If we take 72 away from 80, we end up 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.

On to step 9:
If we divide 80 by 12, we get 6 and a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 21818.166
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.

The final outcome is 21818.166, with a leftover of 0.0008.