78816503 divided by 18 
Let's see how many times 18 fits into 78816503.

Moving on to step 1:
18 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 18

Step 2:
When dividing 78 by 18, we get 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 72 away from 78, we end up with 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 18

Let's proceed to step 3:
68 divided by 18 is 3 with a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 43.0
The remainder is 14 after subtracting 54 from 68.
Include the next digit (1) from the dividend after 14, then repeat: 141 / 18

On to step 4:
18 can be fit into 141 7 times, resulting in a remainder of 15.
Use 7 as the next digit of our solution. 
Result so far: 437.0
Deduct 126 from 141 and we're left with 15.
Include the next digit (6) from the dividend after 15, then repeat: 156 / 18

Going ahead to step 5:
18 goes into 156 8 times with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 4378.0
The remainder is 12 after subtracting 144 from 156.
Include the next digit (5) from the dividend after 12, then repeat: 125 / 18

On to step 6:
18 goes into 125 6 times with a remainder of 17.
The next digit of our result is 6. 
Result so far: 43786.0
The remainder is 17 after subtracting 108 from 125.
Append the next digit (0) from the dividend to 17 and continue with: 170 / 18

Moving on to step 7:
18 goes into 170 9 times with a remainder of 8.
Use 9 as the next digit of our solution. 
Result so far: 437869.0
Subtract 162 from 170 to get 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 18

Moving on to step 8:
When dividing 83 by 18, we get 4 with a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 4378694.0
Subtracting 72 from 83 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 9:
When dividing 110 by 18, we get 6 with a remainder of 2.
Write down 6 as next digit of the result. 
Result so far: 4378694.6
Subtract 108 from 110 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 10:
If we divide 20 by 18, we get 1 and a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 4378694.61
The remainder is 2 after subtracting 18 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 11:
20 divided by 18 is 1 with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 4378694.611
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 4378694.611, with a leftover of 0.0002.