We divide 644365 by 50
The aim is to understand the frequency of 50 in 644365.

Going ahead to step 1:
6 divided by 50 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the 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 / 50

Let's proceed to step 2:
64 divided by 50 is 1 with a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 50 from 64 leaves us with 14.
Append the next digit (4) from the dividend to 14 and continue with: 144 / 50

Moving on to step 3:
When dividing 144 by 50, we get 2 with a remainder of 44.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
If we take 100 away from 144, we end up with 44.
Append the next digit (3) from the dividend to 44 and continue with: 443 / 50

Moving on to step 4:
443 divided by 50 is 8 with a remainder of 43.
Put 8 as the next digit of the answer. 
Result so far: 128.0
Subtracting 400 from 443 leaves us with 43.
Include the next digit (6) from the dividend after 43, then repeat: 436 / 50

Going ahead to step 5:
436 divided by 50 is 8 with a remainder of 36.
Record the quotient 8 as the next digit in the result. 
Result so far: 1288.0
Subtract 400 from 436 to get 36.
Fetch the next digit (5) from the dividend, attach it to 36 and continue: 365 / 50

Advancing to step 6:
The number 50 fits into 365 7 times, leaving a remainder of 15.
The number 7 becomes the next digit in our result. 
Result so far: 12887.0
The remainder is 15 after subtracting 350 from 365.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
The number 50 fits into 150 3 times, leaving a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 12887.3
The remainder is 0 after subtracting 150 from 150.
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:
When dividing 0 by 50, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 12887.3
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.

Step 9:
The number 50 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 12887.3
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.

The final outcome is 12887.3, with a leftover of 0.0.