We're dividing 378360 by 15 
We want to figure out the number of times 378360 can be divided by 15.

Moving on to step 1:
If we divide 3 by 15, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 15

Moving on to step 2:
37 divided by 15 is 2 with a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 30 from 37 and we're left with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 15

On to step 3:
15 goes into 78 5 times with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
If we take 75 away from 78, we end up with 3.
Take the next digit (3) from the dividend and append it to 3, then repeat: 33 / 15

Let's proceed to step 4:
If we divide 33 by 15, we get 2 and a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 252.0
If we subtract 30 from 33, we get 3.
Include the next digit (6) from the dividend after 3, then repeat: 36 / 15

Step 5:
If we divide 36 by 15, we get 2 and a remainder of 6.
The next digit of our result is 2. 
Result so far: 2522.0
If we take 30 away from 36, we end up with 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 15

Advancing to step 6:
The number 15 fits into 60 4 times, leaving a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 25224.0
The remainder is 0 after subtracting 60 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
0 divided by 15 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 25224.0
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 8:
15 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 25224.0
Subtract 0 from 0 to get 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 outcome is 25224.0, with a leftover of 0.0.