12648913 ÷ 390 
We're looking to find how many times 390 goes into 12648913.

On to step 1:
The number 390 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 390

Step 2:
390 can be fit into 12 0 times, resulting in a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Grab the next digit (6) from the dividend, add it to 12, then carry on: 126 / 390

Advancing to step 3:
390 can be fit into 126 0 times, resulting in a remainder of 126.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 126 to get 126.
Include the next digit (4) from the dividend after 126, then repeat: 1264 / 390

Let's proceed to step 4:
If we divide 1264 by 390, we get 3 and a remainder of 94.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 1170 from 1264, we get 94.
Grab the next digit (8) from the dividend, add it to 94, then carry on: 948 / 390

On to step 5:
If we divide 948 by 390, we get 2 and a remainder of 168.
Put 2 as the next digit of the answer. 
Result so far: 32.0
If we subtract 780 from 948, we get 168.
Fetch the next digit (9) from the dividend, attach it to 168 and continue: 1689 / 390

Advancing to step 6:
If we divide 1689 by 390, we get 4 and a remainder of 129.
Write down 4 as next digit of the result. 
Result so far: 324.0
If we subtract 1560 from 1689, we get 129.
Append the next digit (1) from the dividend to 129 and continue with: 1291 / 390

Let's proceed to step 7:
1291 divided by 390 is 3 with a remainder of 121.
Record the quotient 3 as the next digit in the result. 
Result so far: 3243.0
If we subtract 1170 from 1291, we get 121.
Fetch the next digit (3) from the dividend, attach it to 121 and continue: 1213 / 390

Moving on to step 8:
The number 390 fits into 1213 3 times, leaving a remainder of 43.
Put 3 as the next digit of the answer. 
Result so far: 32433.0
If we subtract 1170 from 1213, we get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 9:
430 divided by 390 is 1 with a remainder of 40.
Write down 1 as next digit of the result. 
Result so far: 32433.1
Subtract 390 from 430 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 10:
390 can be fit into 400 1 times, resulting in a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 32433.11
If we take 390 away from 400, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 32433.11 with a remaining 0.01.