12456 ÷ 1 
We're looking to find how many times 1 goes into 12456.

Moving on to step 1:
1 goes into 1 1 times with a remainder of 0.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 0 after subtracting 1 from 1.
Append the next digit (2) from the dividend to 0 and continue with: 2 / 1

Moving on to step 2:
1 goes into 2 2 times with a remainder of 0.
The next digit of our result is 2. 
Result so far: 12.0
If we take 2 away from 2, we end up with 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 1

Advancing to step 3:
1 goes into 4 4 times with a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 124.0
Subtracting 4 from 4 leaves us with 0.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 1

Let's proceed to step 4:
If we divide 5 by 1, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 1245.0
The remainder is 0 after subtracting 5 from 5.
Append the next digit (6) from the dividend to 0 and continue with: 6 / 1

On to step 5:
6 divided by 1 is 6 with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 12456.0
If we take 6 away from 6, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 6:
1 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 12456.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
1 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 12456.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 12456.0 with a remainder of 0.0.