18400568 ÷ 15 
Our goal is to divide 18400568 by 15.

Step 1:
15 can be fit into 1 0 times, resulting in a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 15

Going ahead to step 2:
When dividing 18 by 15, we get 1 with a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 15 from 18 and we're left with 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 15

On to step 3:
15 goes into 34 2 times with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtracting 30 from 34 leaves us with 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 15

Going ahead to step 4:
When dividing 40 by 15, we get 2 with a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 122.0
If we subtract 30 from 40, we get 10.
Append the next digit (0) from the dividend to 10 and continue with: 100 / 15

Step 5:
100 divided by 15 is 6 with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 1226.0
Subtract 90 from 100 to get 10.
Include the next digit (5) from the dividend after 10, then repeat: 105 / 15

Step 6:
15 can be fit into 105 7 times, resulting in a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 12267.0
The remainder is 0 after subtracting 105 from 105.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 15

Advancing to step 7:
6 divided by 15 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 122670.0
If we take 0 away from 6, we end up with 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 15

On to step 8:
When dividing 68 by 15, we get 4 with a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 1226704.0
Subtracting 60 from 68 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 9:
If we divide 80 by 15, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 1226704.5
Deduct 75 from 80 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 10:
If we divide 50 by 15, we get 3 and a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 1226704.53
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 11:
15 goes into 50 3 times with a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 1226704.533
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The quotient of the division is 1226704.533, and the remainder is 0.0005.