121858 divided by 50 
The aim is to understand the frequency of 50 in 121858.

On to step 1:
50 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 50

Going ahead to step 2:
50 can be fit into 12 0 times, resulting in a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 50

On to step 3:
50 goes into 121 2 times with a remainder of 21.
The next digit of our result is 2. 
Result so far: 2.0
If we take 100 away from 121, we end up with 21.
Take the next digit (8) from the dividend and append it to 21, then repeat: 218 / 50

Step 4:
If we divide 218 by 50, we get 4 and a remainder of 18.
The next digit of our result is 4. 
Result so far: 24.0
Deduct 200 from 218 and we're left with 18.
Take the next digit (5) from the dividend and append it to 18, then repeat: 185 / 50

Moving on to step 5:
50 goes into 185 3 times with a remainder of 35.
The next digit of our result is 3. 
Result so far: 243.0
If we subtract 150 from 185, we get 35.
Take the next digit (8) from the dividend and append it to 35, then repeat: 358 / 50

On to step 6:
If we divide 358 by 50, we get 7 and a remainder of 8.
Put 7 as the next digit of the answer. 
Result so far: 2437.0
Subtract 350 from 358 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 7:
When dividing 80 by 50, we get 1 with a remainder of 30.
Put 1 as the next digit of the answer. 
Result so far: 2437.1
The remainder is 30 after subtracting 50 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 8:
50 can be fit into 300 6 times, resulting in a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 2437.16
If we subtract 300 from 300, 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.

Advancing to 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: 2437.16
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.

Step 10:
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: 2437.16
Subtract 0 from 0 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.

Our division results in 2437.16 with a remaining 0.0.