31021166 ÷ 12 
Let's see how many times 12 fits into 31021166.

Step 1:
If we divide 3 by 12, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 12

Advancing to step 2:
12 can be fit into 31 2 times, resulting in a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 24 from 31, we get 7.
Grab the next digit (0) from the dividend, add it to 7, then carry on: 70 / 12

Moving on to step 3:
12 can be fit into 70 5 times, resulting in a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 25.0
Subtracting 60 from 70 leaves us with 10.
Grab the next digit (2) from the dividend, add it to 10, then carry on: 102 / 12

Step 4:
The number 12 fits into 102 8 times, leaving a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 258.0
The remainder is 6 after subtracting 96 from 102.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 12

Going ahead to step 5:
61 divided by 12 is 5 with a remainder of 1.
The next digit of our result is 5. 
Result so far: 2585.0
Subtracting 60 from 61 leaves us with 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 12

Going ahead to step 6:
If we divide 11 by 12, we get 0 and a remainder of 11.
The number 0 becomes the next digit in our result. 
Result so far: 25850.0
The remainder is 11 after subtracting 0 from 11.
Grab the next digit (6) from the dividend, add it to 11, then carry on: 116 / 12

Going ahead to step 7:
12 goes into 116 9 times with a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 258509.0
Deduct 108 from 116 and we're left with 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 12

Let's proceed to step 8:
The number 12 fits into 86 7 times, leaving a remainder of 2.
Put 7 as the next digit of the answer. 
Result so far: 2585097.0
If we take 84 away from 86, 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.

Step 9:
20 divided by 12 is 1 with a remainder of 8.
The next digit of our result is 1. 
Result so far: 2585097.1
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 10:
12 goes into 80 6 times with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 2585097.16
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.

Step 11:
12 goes into 80 6 times with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 2585097.166
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.

Our division results in 2585097.166 with a remaining 0.0008.