We're dividing 901889 by 20 
The aim is to understand the frequency of 20 in 901889.

On to step 1:
The number 20 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 20

Step 2:
20 can be fit into 90 4 times, resulting in a remainder of 10.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 10 after subtracting 80 from 90.
Grab the next digit (1) from the dividend, add it to 10, then carry on: 101 / 20

Step 3:
The number 20 fits into 101 5 times, leaving a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
If we take 100 away from 101, we end up with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 20

Step 4:
20 can be fit into 18 0 times, resulting in a remainder of 18.
The number 0 becomes the next digit in our result. 
Result so far: 450.0
Deduct 0 from 18 and we're left with 18.
Append the next digit (8) from the dividend to 18 and continue with: 188 / 20

Going ahead to step 5:
20 goes into 188 9 times with a remainder of 8.
Put 9 as the next digit of the answer. 
Result so far: 4509.0
If we take 180 away from 188, we end up with 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 20

On to step 6:
The number 20 fits into 89 4 times, leaving a remainder of 9.
The next digit of our result is 4. 
Result so far: 45094.0
Subtracting 80 from 89 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
20 goes into 90 4 times with a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 45094.4
If we take 80 away from 90, we end up 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.

Let's proceed to step 8:
20 goes into 100 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 45094.45
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.

Going ahead to step 9:
20 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 45094.45
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.

Going ahead to step 10:
The number 20 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 45094.45
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.

Our division results in 45094.45 with a remaining 0.0.