66688889 ÷ 12 
We want to figure out the number of times 66688889 can be divided by 12.

Step 1:
12 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 12

Let's proceed to step 2:
12 goes into 66 5 times with a remainder of 6.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
The remainder is 6 after subtracting 60 from 66.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 12

Going ahead to step 3:
The number 12 fits into 66 5 times, leaving a remainder of 6.
Record the quotient 5 as the next digit in the result. 
Result so far: 55.0
Subtract 60 from 66 to get 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 12

Step 4:
12 can be fit into 68 5 times, resulting in a remainder of 8.
Record the quotient 5 as the next digit in the result. 
Result so far: 555.0
Subtracting 60 from 68 leaves us with 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 12

Moving on to step 5:
12 goes into 88 7 times with a remainder of 4.
The next digit of our result is 7. 
Result so far: 5557.0
Deduct 84 from 88 and we're left with 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 12

Advancing to step 6:
48 divided by 12 is 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 55574.0
Deduct 48 from 48 and we're left with 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 12

Moving on to step 7:
If we divide 8 by 12, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 555740.0
Subtract 0 from 8 to get 8.
Include the next digit (9) from the dividend after 8, then repeat: 89 / 12

Going ahead to step 8:
If we divide 89 by 12, we get 7 and a remainder of 5.
The next digit of our result is 7. 
Result so far: 5557407.0
Subtracting 84 from 89 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 9:
50 divided by 12 is 4 with a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 5557407.4
If we take 48 away from 50, we end up with 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 10:
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: 5557407.41
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.

Advancing to step 11:
When dividing 80 by 12, we get 6 with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 5557407.416
Subtracting 72 from 80 leaves us 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.

Step 12:
12 goes into 80 6 times with a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 5557407.4166
The remainder is 8 after subtracting 72 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

In conclusion, the division gives 5557407.4166 with a balance of 8e-05.