20187120 ÷ 990 
The aim is to understand the frequency of 990 in 20187120.

Going ahead to step 1:
When dividing 2 by 990, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 990

Step 2:
The number 990 fits into 20 0 times, leaving a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 20 and we're left with 20.
Include the next digit (1) from the dividend after 20, then repeat: 201 / 990

Moving on to step 3:
When dividing 201 by 990, we get 0 with a remainder of 201.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 201 leaves us with 201.
Grab the next digit (8) from the dividend, add it to 201, then carry on: 2018 / 990

Let's proceed to step 4:
990 can be fit into 2018 2 times, resulting in a remainder of 38.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 1980 from 2018 to get 38.
Fetch the next digit (7) from the dividend, attach it to 38 and continue: 387 / 990

On to step 5:
990 goes into 387 0 times with a remainder of 387.
Use 0 as the next digit of our solution. 
Result so far: 20.0
Subtracting 0 from 387 leaves us with 387.
Take the next digit (1) from the dividend and append it to 387, then repeat: 3871 / 990

Let's proceed to step 6:
990 can be fit into 3871 3 times, resulting in a remainder of 901.
The next digit of our result is 3. 
Result so far: 203.0
Subtract 2970 from 3871 to get 901.
Fetch the next digit (2) from the dividend, attach it to 901 and continue: 9012 / 990

Moving on to step 7:
990 can be fit into 9012 9 times, resulting in a remainder of 102.
Use 9 as the next digit of our solution. 
Result so far: 2039.0
If we take 8910 away from 9012, we end up with 102.
Take the next digit (0) from the dividend and append it to 102, then repeat: 1020 / 990

On to step 8:
1020 divided by 990 is 1 with a remainder of 30.
Use 1 as the next digit of our solution. 
Result so far: 20391.0
If we subtract 990 from 1020, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 9:
990 can be fit into 300 0 times, resulting in a remainder of 300.
Put 0 as the next digit of the answer. 
Result so far: 20391.0
Subtracting 0 from 300 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Advancing to step 10:
3000 divided by 990 is 3 with a remainder of 30.
The next digit of our result is 3. 
Result so far: 20391.03
If we take 2970 away from 3000, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 11:
300 divided by 990 is 0 with a remainder of 300.
The next digit of our result is 0. 
Result so far: 20391.03
Deduct 0 from 300 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Step 12:
The number 990 fits into 3000 3 times, leaving a remainder of 30.
Record the quotient 3 as the next digit in the result. 
Result so far: 20391.0303
Deduct 2970 from 3000 and we're left with 30.
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 13:
The number 990 fits into 300 0 times, leaving a remainder of 300.
Write down 0 as next digit of the result. 
Result so far: 20391.0303
Subtracting 0 from 300 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Step 14:
When dividing 3000 by 990, we get 3 with a remainder of 30.
Record the quotient 3 as the next digit in the result. 
Result so far: 20391.030303
If we take 2970 away from 3000, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 15:
990 goes into 300 0 times with a remainder of 300.
Write down 0 as next digit of the result. 
Result so far: 20391.030303
If we take 0 away from 300, we end up with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

On to step 16:
3000 divided by 990 is 3 with a remainder of 30.
The number 3 becomes the next digit in our result. 
Result so far: 20391.03030303
Subtracting 2970 from 3000 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

In conclusion, the division gives 20391.03030303 with a balance of 3e-08.