515150 ÷ 20 
We're looking to find how many times 20 goes into 515150.

Let's proceed to step 1:
The number 20 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 20

Step 2:
20 can be fit into 51 2 times, resulting in a remainder of 11.
The next digit of our result is 2. 
Result so far: 2.0
If we take 40 away from 51, we end up with 11.
Bring next digit (5) of the dividend behind the 11 and repeat the process: 115 / 20

Advancing to step 3:
If we divide 115 by 20, we get 5 and a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
Deduct 100 from 115 and we're left with 15.
Include the next digit (1) from the dividend after 15, then repeat: 151 / 20

Let's proceed to step 4:
When dividing 151 by 20, we get 7 with a remainder of 11.
Write down 7 as next digit of the result. 
Result so far: 257.0
If we take 140 away from 151, we end up with 11.
Take the next digit (5) from the dividend and append it to 11, then repeat: 115 / 20

Advancing to step 5:
115 divided by 20 is 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 2575.0
If we subtract 100 from 115, we get 15.
Grab the next digit (0) from the dividend, add it to 15, then carry on: 150 / 20

Let's proceed to step 6:
The number 20 fits into 150 7 times, leaving a remainder of 10.
Record the quotient 7 as the next digit in the result. 
Result so far: 25757.0
The remainder is 10 after subtracting 140 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
The number 20 fits into 100 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 25757.5
The remainder is 0 after subtracting 100 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
20 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 25757.5
If we take 0 away from 0, 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.

Advancing to step 9:
0 divided by 20 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 25757.5
Subtracting 0 from 0 leaves us 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.

After the division, we end up with 25757.5 and a remainder of 0.0.