Let's divide 51181612 by 999
The aim is to understand the frequency of 999 in 51181612.

On to step 1:
The number 999 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 999

Let's proceed to step 2:
When dividing 51 by 999, we get 0 with a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Bring next digit (1) of the dividend behind the 51 and repeat the process: 511 / 999

On to step 3:
If we divide 511 by 999, we get 0 and a remainder of 511.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 511 and we're left with 511.
Append the next digit (8) from the dividend to 511 and continue with: 5118 / 999

Going ahead to step 4:
999 can be fit into 5118 5 times, resulting in a remainder of 123.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtracting 4995 from 5118 leaves us with 123.
Include the next digit (1) from the dividend after 123, then repeat: 1231 / 999

Going ahead to step 5:
When dividing 1231 by 999, we get 1 with a remainder of 232.
Use 1 as the next digit of our solution. 
Result so far: 51.0
If we take 999 away from 1231, we end up with 232.
Append the next digit (6) from the dividend to 232 and continue with: 2326 / 999

Step 6:
2326 divided by 999 is 2 with a remainder of 328.
The number 2 becomes the next digit in our result. 
Result so far: 512.0
The remainder is 328 after subtracting 1998 from 2326.
Take the next digit (1) from the dividend and append it to 328, then repeat: 3281 / 999

Advancing to step 7:
3281 divided by 999 is 3 with a remainder of 284.
The next digit of our result is 3. 
Result so far: 5123.0
Subtracting 2997 from 3281 leaves us with 284.
Fetch the next digit (2) from the dividend, attach it to 284 and continue: 2842 / 999

Going ahead to step 8:
When dividing 2842 by 999, we get 2 with a remainder of 844.
Write down 2 as next digit of the result. 
Result so far: 51232.0
If we take 1998 away from 2842, we end up with 844.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8440, and continue the process.

Advancing to step 9:
999 goes into 8440 8 times with a remainder of 448.
Put 8 as the next digit of the answer. 
Result so far: 51232.8
Subtracting 7992 from 8440 leaves us with 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Step 10:
4480 divided by 999 is 4 with a remainder of 484.
Write down 4 as next digit of the result. 
Result so far: 51232.84
Subtracting 3996 from 4480 leaves us with 484.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Let's proceed to step 11:
The number 999 fits into 4840 4 times, leaving a remainder of 844.
Put 4 as the next digit of the answer. 
Result so far: 51232.844
Subtract 3996 from 4840 to get 844.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8440, and continue the process.

In conclusion, the division gives 51232.844 with a balance of 0.0844.