Let's divide 51721922 by 998
The aim is to understand the frequency of 998 in 51721922.

On to step 1:
If we divide 5 by 998, we get 0 and a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 998

On to step 2:
When dividing 51 by 998, we get 0 with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Fetch the next digit (7) from the dividend, attach it to 51 and continue: 517 / 998

Going ahead to step 3:
517 divided by 998 is 0 with a remainder of 517.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 517 leaves us with 517.
Include the next digit (2) from the dividend after 517, then repeat: 5172 / 998

Advancing to step 4:
998 goes into 5172 5 times with a remainder of 182.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtract 4990 from 5172 to get 182.
Include the next digit (1) from the dividend after 182, then repeat: 1821 / 998

Advancing to step 5:
998 can be fit into 1821 1 times, resulting in a remainder of 823.
Record the quotient 1 as the next digit in the result. 
Result so far: 51.0
If we subtract 998 from 1821, we get 823.
Append the next digit (9) from the dividend to 823 and continue with: 8239 / 998

Moving on to step 6:
998 goes into 8239 8 times with a remainder of 255.
Write down 8 as next digit of the result. 
Result so far: 518.0
Deduct 7984 from 8239 and we're left with 255.
Fetch the next digit (2) from the dividend, attach it to 255 and continue: 2552 / 998

Moving on to step 7:
2552 divided by 998 is 2 with a remainder of 556.
Record the quotient 2 as the next digit in the result. 
Result so far: 5182.0
If we subtract 1996 from 2552, we get 556.
Bring next digit (2) of the dividend behind the 556 and repeat the process: 5562 / 998

Advancing to step 8:
998 can be fit into 5562 5 times, resulting in a remainder of 572.
The number 5 becomes the next digit in our result. 
Result so far: 51825.0
If we subtract 4990 from 5562, we get 572.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

Let's proceed to step 9:
998 goes into 5720 5 times with a remainder of 730.
Write down 5 as next digit of the result. 
Result so far: 51825.5
The remainder is 730 after subtracting 4990 from 5720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7300, and continue the process.

Going ahead to step 10:
998 can be fit into 7300 7 times, resulting in a remainder of 314.
Put 7 as the next digit of the answer. 
Result so far: 51825.57
If we subtract 6986 from 7300, we get 314.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Going ahead to step 11:
998 can be fit into 3140 3 times, resulting in a remainder of 146.
Write down 3 as next digit of the result. 
Result so far: 51825.573
Subtract 2994 from 3140 to get 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Advancing to step 12:
The number 998 fits into 1460 1 times, leaving a remainder of 462.
The number 1 becomes the next digit in our result. 
Result so far: 51825.5731
If we take 998 away from 1460, we end up with 462.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4620, and continue the process.

On to step 13:
When dividing 4620 by 998, we get 4 with a remainder of 628.
Write down 4 as next digit of the result. 
Result so far: 51825.57314
Subtracting 3992 from 4620 leaves us with 628.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6280, and continue the process.

Going ahead to step 14:
6280 divided by 998 is 6 with a remainder of 292.
Use 6 as the next digit of our solution. 
Result so far: 51825.573146
If we subtract 5988 from 6280, we get 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Let's proceed to step 15:
The number 998 fits into 2920 2 times, leaving a remainder of 924.
Use 2 as the next digit of our solution. 
Result so far: 51825.5731462
If we subtract 1996 from 2920, we get 924.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9240, and continue the process.

Going ahead to step 16:
The number 998 fits into 9240 9 times, leaving a remainder of 258.
Put 9 as the next digit of the answer. 
Result so far: 51825.57314629
Subtracting 8982 from 9240 leaves us with 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

In conclusion, the division gives 51825.57314629 with a balance of 2.58e-07.