12990474 ÷ 946 
We want to divide 12990474 by 946.

Advancing to step 1:
946 goes into 1 0 times with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 946

Going ahead to step 2:
946 goes into 12 0 times with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Bring next digit (9) of the dividend behind the 12 and repeat the process: 129 / 946

Let's proceed to step 3:
946 goes into 129 0 times with a remainder of 129.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 129 to get 129.
Include the next digit (9) from the dividend after 129, then repeat: 1299 / 946

Going ahead to step 4:
946 goes into 1299 1 times with a remainder of 353.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 946 from 1299 and we're left with 353.
Grab the next digit (0) from the dividend, add it to 353, then carry on: 3530 / 946

Advancing to step 5:
The number 946 fits into 3530 3 times, leaving a remainder of 692.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Subtracting 2838 from 3530 leaves us with 692.
Take the next digit (4) from the dividend and append it to 692, then repeat: 6924 / 946

Going ahead to step 6:
When dividing 6924 by 946, we get 7 with a remainder of 302.
The next digit of our result is 7. 
Result so far: 137.0
If we take 6622 away from 6924, we end up with 302.
Include the next digit (7) from the dividend after 302, then repeat: 3027 / 946

Moving on to step 7:
When dividing 3027 by 946, we get 3 with a remainder of 189.
The number 3 becomes the next digit in our result. 
Result so far: 1373.0
The remainder is 189 after subtracting 2838 from 3027.
Take the next digit (4) from the dividend and append it to 189, then repeat: 1894 / 946

On to step 8:
946 can be fit into 1894 2 times, resulting in a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 13732.0
The remainder is 2 after subtracting 1892 from 1894.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 9:
When dividing 20 by 946, we get 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 13732.0
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 10:
946 goes into 200 0 times with a remainder of 200.
Record the quotient 0 as the next digit in the result. 
Result so far: 13732.0
Subtracting 0 from 200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Our division results in 13732.0 with a remaining 0.2.