428221 ÷ 50 
The aim is to understand the frequency of 50 in 428221.

Step 1:
When dividing 4 by 50, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 50

Let's proceed to step 2:
If we divide 42 by 50, we get 0 and a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 42 to get 42.
Bring next digit (8) of the dividend behind the 42 and repeat the process: 428 / 50

Let's proceed to step 3:
The number 50 fits into 428 8 times, leaving a remainder of 28.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we take 400 away from 428, we end up with 28.
Append the next digit (2) from the dividend to 28 and continue with: 282 / 50

Advancing to step 4:
50 goes into 282 5 times with a remainder of 32.
Put 5 as the next digit of the answer. 
Result so far: 85.0
The remainder is 32 after subtracting 250 from 282.
Bring next digit (2) of the dividend behind the 32 and repeat the process: 322 / 50

Moving on to step 5:
322 divided by 50 is 6 with a remainder of 22.
Write down 6 as next digit of the result. 
Result so far: 856.0
Deduct 300 from 322 and we're left with 22.
Include the next digit (1) from the dividend after 22, then repeat: 221 / 50

Advancing to step 6:
50 can be fit into 221 4 times, resulting in a remainder of 21.
The next digit of our result is 4. 
Result so far: 8564.0
Deduct 200 from 221 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 7:
The number 50 fits into 210 4 times, leaving a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 8564.4
Deduct 200 from 210 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
100 divided by 50 is 2 with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 8564.42
Deduct 100 from 100 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.

Step 9:
The number 50 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 8564.42
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:
When dividing 0 by 50, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 8564.42
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 result is 8564.42 with a remainder of 0.0.