640190 ÷ 12 
Let's see how many times 12 fits into 640190.

Let's proceed to step 1:
6 divided by 12 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 12

Moving on to step 2:
12 can be fit into 64 5 times, resulting in a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtracting 60 from 64 leaves us with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 12

Moving on to step 3:
If we divide 40 by 12, we get 3 and a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 53.0
The remainder is 4 after subtracting 36 from 40.
Append the next digit (1) from the dividend to 4 and continue with: 41 / 12

Moving on to step 4:
When dividing 41 by 12, we get 3 with a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 533.0
Deduct 36 from 41 and we're left with 5.
Append the next digit (9) from the dividend to 5 and continue with: 59 / 12

On to step 5:
When dividing 59 by 12, we get 4 with a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 5334.0
Deduct 48 from 59 and we're left with 11.
Include the next digit (0) from the dividend after 11, then repeat: 110 / 12

Step 6:
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: 53349.0
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.

Advancing to step 7:
The number 12 fits into 20 1 times, leaving a remainder of 8.
The next digit of our result is 1. 
Result so far: 53349.1
If we take 12 away from 20, 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 8:
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: 53349.16
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.

Advancing to step 9:
80 divided by 12 is 6 with a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 53349.166
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.

The quotient of the division is 53349.166, and the remainder is 0.0008.