515151 ÷ 26 
We want to figure out the number of times 515151 can be divided by 26.

Moving on to step 1:
If we divide 5 by 26, we get 0 and a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 26

On to step 2:
When dividing 51 by 26, we get 1 with a remainder of 25.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 26 away from 51, we end up with 25.
Take the next digit (5) from the dividend and append it to 25, then repeat: 255 / 26

On to step 3:
255 divided by 26 is 9 with a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 19.0
If we take 234 away from 255, we end up with 21.
Take the next digit (1) from the dividend and append it to 21, then repeat: 211 / 26

Moving on to step 4:
If we divide 211 by 26, we get 8 and a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 198.0
Deduct 208 from 211 and we're left with 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 26

Going ahead to step 5:
35 divided by 26 is 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 1981.0
Subtracting 26 from 35 leaves us with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 26

Let's proceed to step 6:
91 divided by 26 is 3 with a remainder of 13.
Record the quotient 3 as the next digit in the result. 
Result so far: 19813.0
If we subtract 78 from 91, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 7:
If we divide 130 by 26, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 19813.5
Subtracting 130 from 130 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.

Moving on to step 8:
26 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 19813.5
If we subtract 0 from 0, we 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 9:
When dividing 0 by 26, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 19813.5
If we subtract 0 from 0, we 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.

The quotient of the division is 19813.5, and the remainder is 0.0.