251218 ÷ 20 
Let's see how many times 20 fits into 251218.

Going ahead to step 1:
20 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 20

Advancing to step 2:
The number 20 fits into 25 1 times, leaving a remainder of 5.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 20 from 25 and we're left with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 20

On to step 3:
The number 20 fits into 51 2 times, leaving a remainder of 11.
Write down 2 as next digit of the result. 
Result so far: 12.0
The remainder is 11 after subtracting 40 from 51.
Fetch the next digit (2) from the dividend, attach it to 11 and continue: 112 / 20

Let's proceed to step 4:
The number 20 fits into 112 5 times, leaving a remainder of 12.
Use 5 as the next digit of our solution. 
Result so far: 125.0
Subtract 100 from 112 to get 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 20

On to step 5:
The number 20 fits into 121 6 times, leaving a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 1256.0
The remainder is 1 after subtracting 120 from 121.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 20

Step 6:
20 goes into 18 0 times with a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 12560.0
If we subtract 0 from 18, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 7:
When dividing 180 by 20, we get 9 with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 12560.9
If we take 180 away from 180, 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.

Going ahead to step 8:
If we divide 0 by 20, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 12560.9
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.

Let's proceed to step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 12560.9
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.

Our division results in 12560.9 with a remaining 0.0.