Let's divide 20978490 by 999
The aim is to understand the frequency of 999 in 20978490.

Going ahead to step 1:
2 divided by 999 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 999

Moving on to step 2:
If we divide 20 by 999, we get 0 and 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 (9) from the dividend after 20, then repeat: 209 / 999

Moving on to step 3:
209 divided by 999 is 0 with a remainder of 209.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 209 and we're left with 209.
Fetch the next digit (7) from the dividend, attach it to 209 and continue: 2097 / 999

Let's proceed to step 4:
999 can be fit into 2097 2 times, resulting in a remainder of 99.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 1998 from 2097 leaves us with 99.
Include the next digit (8) from the dividend after 99, then repeat: 998 / 999

Going ahead to step 5:
999 can be fit into 998 0 times, resulting in a remainder of 998.
Write down 0 as next digit of the result. 
Result so far: 20.0
Deduct 0 from 998 and we're left with 998.
Take the next digit (4) from the dividend and append it to 998, then repeat: 9984 / 999

Let's proceed to step 6:
When dividing 9984 by 999, we get 9 with a remainder of 993.
The next digit of our result is 9. 
Result so far: 209.0
Subtracting 8991 from 9984 leaves us with 993.
Fetch the next digit (9) from the dividend, attach it to 993 and continue: 9939 / 999

Moving on to step 7:
If we divide 9939 by 999, we get 9 and a remainder of 948.
Use 9 as the next digit of our solution. 
Result so far: 2099.0
Subtract 8991 from 9939 to get 948.
Bring next digit (0) of the dividend behind the 948 and repeat the process: 9480 / 999

Going ahead to step 8:
When dividing 9480 by 999, we get 9 with a remainder of 489.
Write down 9 as next digit of the result. 
Result so far: 20999.0
Subtracting 8991 from 9480 leaves us with 489.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4890, and continue the process.

Advancing to step 9:
The number 999 fits into 4890 4 times, leaving a remainder of 894.
The number 4 becomes the next digit in our result. 
Result so far: 20999.4
Subtract 3996 from 4890 to get 894.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8940, and continue the process.

Going ahead to step 10:
8940 divided by 999 is 8 with a remainder of 948.
Write down 8 as next digit of the result. 
Result so far: 20999.48
If we take 7992 away from 8940, we end up with 948.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9480, and continue the process.

Going ahead to step 11:
9480 divided by 999 is 9 with a remainder of 489.
Put 9 as the next digit of the answer. 
Result so far: 20999.489
The remainder is 489 after subtracting 8991 from 9480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4890, and continue the process.

Advancing to step 12:
If we divide 4890 by 999, we get 4 and a remainder of 894.
Use 4 as the next digit of our solution. 
Result so far: 20999.4894
If we subtract 3996 from 4890, we get 894.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8940, and continue the process.

Advancing to step 13:
When dividing 8940 by 999, we get 8 with a remainder of 948.
The next digit of our result is 8. 
Result so far: 20999.48948
The remainder is 948 after subtracting 7992 from 8940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9480, and continue the process.

Moving on to step 14:
9480 divided by 999 is 9 with a remainder of 489.
The number 9 becomes the next digit in our result. 
Result so far: 20999.489489
The remainder is 489 after subtracting 8991 from 9480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4890, and continue the process.

Going ahead to step 15:
4890 divided by 999 is 4 with a remainder of 894.
Use 4 as the next digit of our solution. 
Result so far: 20999.4894894
The remainder is 894 after subtracting 3996 from 4890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8940, and continue the process.

Step 16:
When dividing 8940 by 999, we get 8 with a remainder of 948.
Record the quotient 8 as the next digit in the result. 
Result so far: 20999.48948948
Deduct 7992 from 8940 and we're left with 948.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9480, and continue the process.

Our division results in 20999.48948948 with a remaining 9.48e-07.