We divide 646644 by 10
The aim is to understand the frequency of 10 in 646644.

On to step 1:
If we divide 6 by 10, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 10

Going ahead to step 2:
If we divide 64 by 10, we get 6 and a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 6.0
Deduct 60 from 64 and we're left with 4.
Fetch the next digit (6) from the dividend, attach it to 4 and continue: 46 / 10

Step 3:
46 divided by 10 is 4 with a remainder of 6.
The next digit of our result is 4. 
Result so far: 64.0
Subtract 40 from 46 to get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 10

Moving on to step 4:
The number 10 fits into 66 6 times, leaving a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 646.0
If we subtract 60 from 66, we get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 10

Advancing to step 5:
10 goes into 64 6 times with a remainder of 4.
The next digit of our result is 6. 
Result so far: 6466.0
The remainder is 4 after subtracting 60 from 64.
Include the next digit (4) from the dividend after 4, then repeat: 44 / 10

Step 6:
When dividing 44 by 10, we get 4 with a remainder of 4.
Put 4 as the next digit of the answer. 
Result so far: 64664.0
Subtract 40 from 44 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
If we divide 40 by 10, we get 4 and a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 64664.4
If we take 40 away from 40, 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.

Let's proceed to step 8:
The number 10 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 64664.4
Deduct 0 from 0 and we're left 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:
If we divide 0 by 10, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 64664.4
Deduct 0 from 0 and we're left 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 64664.4 with a remainder of 0.0.