We divide 51287809 by 1
The aim is to understand the frequency of 1 in 51287809.

Going ahead to step 1:
1 goes into 5 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Deduct 5 from 5 and we're left with 0.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 1

Let's proceed to step 2:
When dividing 1 by 1, we get 1 with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 51.0
If we subtract 1 from 1, we get 0.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 1

Going ahead to step 3:
If we divide 2 by 1, we get 2 and a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 512.0
If we subtract 2 from 2, we get 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 1

On to step 4:
If we divide 8 by 1, we get 8 and a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 5128.0
Deduct 8 from 8 and we're left with 0.
Include the next digit (7) from the dividend after 0, then repeat: 7 / 1

Step 5:
The number 1 fits into 7 7 times, leaving a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 51287.0
If we take 7 away from 7, we end up with 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 1

Going ahead to step 6:
8 divided by 1 is 8 with a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 512878.0
Subtract 8 from 8 to get 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 1

Advancing to step 7:
1 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: 5128780.0
Subtract 0 from 0 to get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 1

On to step 8:
1 can be fit into 9 9 times, resulting in a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 51287809.0
Subtract 9 from 9 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 9:
1 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 51287809.0
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.

Let's proceed to step 10:
1 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 51287809.0
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.

The final result is 51287809.0 with a remainder of 0.0.