31003 ÷ 12 
We want to divide 31003 by 12.

Let's proceed to 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
If we take 0 away from 3, we end up with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 12

Step 2:
31 divided by 12 is 2 with a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 7 after subtracting 24 from 31.
Fetch the next digit (0) from the dividend, attach it to 7 and continue: 70 / 12

Step 3:
12 can be fit into 70 5 times, resulting in a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
If we take 60 away from 70, we end up with 10.
Fetch the next digit (0) from the dividend, attach it to 10 and continue: 100 / 12

Let's proceed to step 4:
If we divide 100 by 12, we get 8 and a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 258.0
Subtracting 96 from 100 leaves us with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 12

On to step 5:
12 can be fit into 43 3 times, resulting in a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 2583.0
Subtract 36 from 43 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 6:
70 divided by 12 is 5 with a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 2583.5
If we subtract 60 from 70, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 7:
12 can be fit into 100 8 times, resulting in a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 2583.58
Deduct 96 from 100 and we're left 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 8:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 2583.583
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.

On to step 9:
12 goes into 40 3 times with a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 2583.5833
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 2583.5833 with a remainder of 4e-05.