646903 ÷ 50 
The aim is to understand the frequency of 50 in 646903.

Step 1:
When dividing 6 by 50, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 50

Going ahead to step 2:
50 goes into 64 1 times with a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 50 from 64 to get 14.
Take the next digit (6) from the dividend and append it to 14, then repeat: 146 / 50

Let's proceed to step 3:
146 divided by 50 is 2 with a remainder of 46.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtract 100 from 146 to get 46.
Take the next digit (9) from the dividend and append it to 46, then repeat: 469 / 50

Let's proceed to step 4:
The number 50 fits into 469 9 times, leaving a remainder of 19.
Use 9 as the next digit of our solution. 
Result so far: 129.0
Subtracting 450 from 469 leaves us with 19.
Append the next digit (0) from the dividend to 19 and continue with: 190 / 50

Let's proceed to step 5:
190 divided by 50 is 3 with a remainder of 40.
The next digit of our result is 3. 
Result so far: 1293.0
The remainder is 40 after subtracting 150 from 190.
Append the next digit (3) from the dividend to 40 and continue with: 403 / 50

Let's proceed to step 6:
If we divide 403 by 50, we get 8 and a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 12938.0
The remainder is 3 after subtracting 400 from 403.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
30 divided by 50 is 0 with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 12938.0
Deduct 0 from 30 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
50 can be fit into 300 6 times, resulting in a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 12938.06
Subtract 300 from 300 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.

Step 9:
If we divide 0 by 50, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 12938.06
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:
50 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: 12938.06
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.

Our division results in 12938.06 with a remaining 0.0.