We look at the division of 640926 by 1 
The aim is to understand the frequency of 1 in 640926.

Step 1:
6 divided by 1 is 6 with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 6.0
If we subtract 6 from 6, we get 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 1

Going ahead to step 2:
When dividing 4 by 1, we get 4 with a remainder of 0.
The next digit of our result is 4. 
Result so far: 64.0
Subtract 4 from 4 to get 0.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 1

Let's proceed to step 3:
When dividing 0 by 1, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 640.0
The remainder is 0 after subtracting 0 from 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 1

Advancing to step 4:
The number 1 fits into 9 9 times, leaving a remainder of 0.
The next digit of our result is 9. 
Result so far: 6409.0
Deduct 9 from 9 and we're left with 0.
Append the next digit (2) from the dividend to 0 and continue with: 2 / 1

Step 5:
The number 1 fits into 2 2 times, leaving a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 64092.0
The remainder is 0 after subtracting 2 from 2.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 1

Going ahead to step 6:
When dividing 6 by 1, we get 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 640926.0
Subtract 6 from 6 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 7:
When dividing 0 by 1, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 640926.0
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.

On to step 8:
If we divide 0 by 1, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 640926.0
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 final outcome is 640926.0, with a leftover of 0.0.