We look at the division of 250858 by 20 
The aim is to understand the frequency of 20 in 250858.

Let's proceed to step 1:
20 can be fit into 2 0 times, resulting in a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 20

Going ahead to step 2:
The number 20 fits into 25 1 times, leaving a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 20 away from 25, we end up with 5.
Grab the next digit (0) from the dividend, add it to 5, then carry on: 50 / 20

On to step 3:
20 can be fit into 50 2 times, resulting in a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtract 40 from 50 to get 10.
Bring next digit (8) of the dividend behind the 10 and repeat the process: 108 / 20

On to step 4:
20 can be fit into 108 5 times, resulting in a remainder of 8.
The number 5 becomes the next digit in our result. 
Result so far: 125.0
Subtract 100 from 108 to get 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 20

Step 5:
20 can be fit into 85 4 times, resulting in a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 1254.0
If we take 80 away from 85, we end up with 5.
Grab the next digit (8) from the dividend, add it to 5, then carry on: 58 / 20

Going ahead to step 6:
When dividing 58 by 20, we get 2 with a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 12542.0
The remainder is 18 after subtracting 40 from 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 7:
20 can be fit into 180 9 times, resulting in a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 12542.9
Subtracting 180 from 180 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.

Let's proceed to step 8:
20 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: 12542.9
Deduct 0 from 0 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.

Going ahead to step 9:
20 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 12542.9
Deduct 0 from 0 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.

The final outcome is 12542.9, with a leftover of 0.0.