91618721 ÷ 50 
The aim is to understand the frequency of 50 in 91618721.

On to step 1:
If we divide 9 by 50, we get 0 and a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 50

Let's proceed to step 2:
When dividing 91 by 50, we get 1 with a remainder of 41.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 50 from 91 to get 41.
Append the next digit (6) from the dividend to 41 and continue with: 416 / 50

Step 3:
When dividing 416 by 50, we get 8 with a remainder of 16.
The next digit of our result is 8. 
Result so far: 18.0
Subtract 400 from 416 to get 16.
Include the next digit (1) from the dividend after 16, then repeat: 161 / 50

Moving on to step 4:
When dividing 161 by 50, we get 3 with a remainder of 11.
Put 3 as the next digit of the answer. 
Result so far: 183.0
Subtracting 150 from 161 leaves us with 11.
Take the next digit (8) from the dividend and append it to 11, then repeat: 118 / 50

Moving on to step 5:
50 can be fit into 118 2 times, resulting in a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 1832.0
If we subtract 100 from 118, we get 18.
Include the next digit (7) from the dividend after 18, then repeat: 187 / 50

On to step 6:
The number 50 fits into 187 3 times, leaving a remainder of 37.
Write down 3 as next digit of the result. 
Result so far: 18323.0
The remainder is 37 after subtracting 150 from 187.
Fetch the next digit (2) from the dividend, attach it to 37 and continue: 372 / 50

Step 7:
372 divided by 50 is 7 with a remainder of 22.
Use 7 as the next digit of our solution. 
Result so far: 183237.0
The remainder is 22 after subtracting 350 from 372.
Bring next digit (1) of the dividend behind the 22 and repeat the process: 221 / 50

Moving on to step 8:
50 goes into 221 4 times with a remainder of 21.
Write down 4 as next digit of the result. 
Result so far: 1832374.0
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 9:
50 can be fit into 210 4 times, resulting in a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 1832374.4
Subtract 200 from 210 to get 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 10:
50 can be fit into 100 2 times, resulting in a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 1832374.42
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.

Advancing to step 11:
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: 1832374.42
Subtracting 0 from 0 leaves us 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.

On to step 12:
50 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1832374.42
Subtracting 0 from 0 leaves us 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.

In conclusion, the division gives 1832374.42 with a balance of 0.0.