21649901 ÷ 998 
The aim is to understand the frequency of 998 in 21649901.

On to step 1:
998 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 998

Moving on to step 2:
998 goes into 21 0 times with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Fetch the next digit (6) from the dividend, attach it to 21 and continue: 216 / 998

On to step 3:
When dividing 216 by 998, we get 0 with a remainder of 216.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 216 and we're left with 216.
Include the next digit (4) from the dividend after 216, then repeat: 2164 / 998

Moving on to step 4:
If we divide 2164 by 998, we get 2 and a remainder of 168.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 1996 from 2164 and we're left with 168.
Append the next digit (9) from the dividend to 168 and continue with: 1689 / 998

Let's proceed to step 5:
1689 divided by 998 is 1 with a remainder of 691.
Write down 1 as next digit of the result. 
Result so far: 21.0
Subtract 998 from 1689 to get 691.
Append the next digit (9) from the dividend to 691 and continue with: 6919 / 998

Advancing to step 6:
When dividing 6919 by 998, we get 6 with a remainder of 931.
Use 6 as the next digit of our solution. 
Result so far: 216.0
Subtract 5988 from 6919 to get 931.
Append the next digit (0) from the dividend to 931 and continue with: 9310 / 998

Moving on to step 7:
The number 998 fits into 9310 9 times, leaving a remainder of 328.
Put 9 as the next digit of the answer. 
Result so far: 2169.0
Subtracting 8982 from 9310 leaves us with 328.
Fetch the next digit (1) from the dividend, attach it to 328 and continue: 3281 / 998

Advancing to step 8:
3281 divided by 998 is 3 with a remainder of 287.
Write down 3 as next digit of the result. 
Result so far: 21693.0
Subtracting 2994 from 3281 leaves us with 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Going ahead to step 9:
The number 998 fits into 2870 2 times, leaving a remainder of 874.
The next digit of our result is 2. 
Result so far: 21693.2
Deduct 1996 from 2870 and we're left with 874.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8740, and continue the process.

Going ahead to step 10:
998 can be fit into 8740 8 times, resulting in a remainder of 756.
The number 8 becomes the next digit in our result. 
Result so far: 21693.28
Deduct 7984 from 8740 and we're left with 756.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7560, and continue the process.

Let's proceed to step 11:
If we divide 7560 by 998, we get 7 and a remainder of 574.
The number 7 becomes the next digit in our result. 
Result so far: 21693.287
Deduct 6986 from 7560 and we're left with 574.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5740, and continue the process.

Let's proceed to step 12:
If we divide 5740 by 998, we get 5 and a remainder of 750.
The next digit of our result is 5. 
Result so far: 21693.2875
Deduct 4990 from 5740 and we're left with 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Step 13:
If we divide 7500 by 998, we get 7 and a remainder of 514.
The number 7 becomes the next digit in our result. 
Result so far: 21693.28757
Deduct 6986 from 7500 and we're left with 514.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5140, and continue the process.

Let's proceed to step 14:
998 goes into 5140 5 times with a remainder of 150.
The number 5 becomes the next digit in our result. 
Result so far: 21693.287575
If we subtract 4990 from 5140, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

On to step 15:
The number 998 fits into 1500 1 times, leaving a remainder of 502.
Record the quotient 1 as the next digit in the result. 
Result so far: 21693.2875751
The remainder is 502 after subtracting 998 from 1500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5020, and continue the process.

Moving on to step 16:
998 goes into 5020 5 times with a remainder of 30.
Write down 5 as next digit of the result. 
Result so far: 21693.28757515
The remainder is 30 after subtracting 4990 from 5020.
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 21693.28757515 with a balance of 3e-08.