12280515 ÷ 404 
Our goal is to divide 12280515 by 404.

Advancing to step 1:
The number 404 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 404

Going ahead to step 2:
When dividing 12 by 404, we get 0 with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Bring next digit (2) of the dividend behind the 12 and repeat the process: 122 / 404

Moving on to step 3:
122 divided by 404 is 0 with a remainder of 122.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 122 to get 122.
Append the next digit (8) from the dividend to 122 and continue with: 1228 / 404

Going ahead to step 4:
404 can be fit into 1228 3 times, resulting in a remainder of 16.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 1212 from 1228 leaves us with 16.
Include the next digit (0) from the dividend after 16, then repeat: 160 / 404

Let's proceed to step 5:
160 divided by 404 is 0 with a remainder of 160.
The next digit of our result is 0. 
Result so far: 30.0
If we take 0 away from 160, we end up with 160.
Append the next digit (5) from the dividend to 160 and continue with: 1605 / 404

Moving on to step 6:
404 can be fit into 1605 3 times, resulting in a remainder of 393.
Record the quotient 3 as the next digit in the result. 
Result so far: 303.0
Subtracting 1212 from 1605 leaves us with 393.
Bring next digit (1) of the dividend behind the 393 and repeat the process: 3931 / 404

On to step 7:
3931 divided by 404 is 9 with a remainder of 295.
The number 9 becomes the next digit in our result. 
Result so far: 3039.0
Subtract 3636 from 3931 to get 295.
Include the next digit (5) from the dividend after 295, then repeat: 2955 / 404

Let's proceed to step 8:
404 can be fit into 2955 7 times, resulting in a remainder of 127.
The next digit of our result is 7. 
Result so far: 30397.0
Subtract 2828 from 2955 to get 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Going ahead to step 9:
If we divide 1270 by 404, we get 3 and a remainder of 58.
Put 3 as the next digit of the answer. 
Result so far: 30397.3
The remainder is 58 after subtracting 1212 from 1270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 10:
The number 404 fits into 580 1 times, leaving a remainder of 176.
The next digit of our result is 1. 
Result so far: 30397.31
Subtracting 404 from 580 leaves us with 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Advancing to step 11:
The number 404 fits into 1760 4 times, leaving a remainder of 144.
The number 4 becomes the next digit in our result. 
Result so far: 30397.314
The remainder is 144 after subtracting 1616 from 1760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

On to step 12:
The number 404 fits into 1440 3 times, leaving a remainder of 228.
The next digit of our result is 3. 
Result so far: 30397.3143
The remainder is 228 after subtracting 1212 from 1440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Step 13:
2280 divided by 404 is 5 with a remainder of 260.
The number 5 becomes the next digit in our result. 
Result so far: 30397.31435
If we take 2020 away from 2280, we end up with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Step 14:
When dividing 2600 by 404, we get 6 with a remainder of 176.
Use 6 as the next digit of our solution. 
Result so far: 30397.314356
Subtracting 2424 from 2600 leaves us with 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Let's proceed to step 15:
404 goes into 1760 4 times with a remainder of 144.
Put 4 as the next digit of the answer. 
Result so far: 30397.3143564
If we subtract 1616 from 1760, we get 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Let's proceed to step 16:
If we divide 1440 by 404, we get 3 and a remainder of 228.
The next digit of our result is 3. 
Result so far: 30397.31435643
The remainder is 228 after subtracting 1212 from 1440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Our division results in 30397.31435643 with a remaining 2.28e-07.