We're dividing 640660 by 1 
The aim is to understand the frequency of 1 in 640660.

Advancing to step 1:
The number 1 fits into 6 6 times, leaving a remainder of 0.
Record the quotient 6 as the next digit in 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

On to step 2:
The number 1 fits into 4 4 times, leaving a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 64.0
If we take 4 away from 4, we end up with 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 1

Advancing to step 3:
When dividing 0 by 1, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 640.0
The remainder is 0 after subtracting 0 from 0.
Include the next digit (6) from the dividend after 0, then repeat: 6 / 1

Moving on to step 4:
If we divide 6 by 1, we get 6 and a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 6406.0
Subtracting 6 from 6 leaves us with 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 1

Advancing to step 5:
1 can be fit into 6 6 times, resulting in a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 64066.0
If we subtract 6 from 6, we get 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 1

Moving on to step 6:
1 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 640660.0
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.

Going ahead to step 7:
1 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 640660.0
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.

Step 8:
0 divided by 1 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 640660.0
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 quotient of the division is 640660.0, and the remainder is 0.0.