We look at the division of 248121 by 18 
We're looking to find how many times 18 goes into 248121.

On to step 1:
18 can be fit into 2 0 times, resulting in a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 18

On to step 2:
18 can be fit into 24 1 times, resulting in a remainder of 6.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 18 from 24, we get 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 18

Going ahead to step 3:
18 goes into 68 3 times with a remainder of 14.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
The remainder is 14 after subtracting 54 from 68.
Append the next digit (1) from the dividend to 14 and continue with: 141 / 18

Step 4:
18 goes into 141 7 times with a remainder of 15.
Put 7 as the next digit of the answer. 
Result so far: 137.0
If we take 126 away from 141, we end up with 15.
Include the next digit (2) from the dividend after 15, then repeat: 152 / 18

Advancing to step 5:
If we divide 152 by 18, we get 8 and a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 1378.0
Subtract 144 from 152 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 18

Step 6:
If we divide 81 by 18, we get 4 and a remainder of 9.
The next digit of our result is 4. 
Result so far: 13784.0
Deduct 72 from 81 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 7:
18 goes into 90 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 13784.5
Subtract 90 from 90 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.

Going ahead to step 8:
The number 18 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 13784.5
Deduct 0 from 0 and we're left 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.

Step 9:
0 divided by 18 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 13784.5
Deduct 0 from 0 and we're left 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 quotient of the division is 13784.5, and the remainder is 0.0.