We look at the division of 667021 by 12 
Let's see how many times 12 fits into 667021.

Going ahead to step 1:
When dividing 6 by 12, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 12

Moving on to step 2:
If we divide 66 by 12, we get 5 and a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 5.0
The remainder is 6 after subtracting 60 from 66.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 12

On to step 3:
12 goes into 67 5 times with a remainder of 7.
Use 5 as the next digit of our solution. 
Result so far: 55.0
Deduct 60 from 67 and we're left with 7.
Include the next digit (0) from the dividend after 7, then repeat: 70 / 12

Going ahead to step 4:
12 goes into 70 5 times with a remainder of 10.
The next digit of our result is 5. 
Result so far: 555.0
Deduct 60 from 70 and we're left with 10.
Bring next digit (2) of the dividend behind the 10 and repeat the process: 102 / 12

Going ahead to step 5:
12 can be fit into 102 8 times, resulting in a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 5558.0
Subtract 96 from 102 to get 6.
Append the next digit (1) from the dividend to 6 and continue with: 61 / 12

Moving on to step 6:
12 goes into 61 5 times with a remainder of 1.
The next digit of our result is 5. 
Result so far: 55585.0
If we subtract 60 from 61, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
12 can be fit into 10 0 times, resulting in a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 55585.0
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
When dividing 100 by 12, we get 8 with a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 55585.08
Subtracting 96 from 100 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 9:
If we divide 40 by 12, we get 3 and a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 55585.083
If we take 36 away from 40, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 10:
12 goes into 40 3 times with a remainder of 4.
The next digit of our result is 3. 
Result so far: 55585.0833
If we take 36 away from 40, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final result is 55585.0833 with a remainder of 4e-05.