991218 divided by 3 
The aim is to understand the frequency of 3 in 991218.

On to step 1:
3 can be fit into 9 3 times, resulting in a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 9 from 9 to get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 3

Moving on to step 2:
3 goes into 9 3 times with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 33.0
The remainder is 0 after subtracting 9 from 9.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 3

Going ahead to step 3:
When dividing 1 by 3, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 330.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 3

Step 4:
The number 3 fits into 12 4 times, leaving a remainder of 0.
Record the quotient 4 as the next digit in the result. 
Result so far: 3304.0
Deduct 12 from 12 and we're left with 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 3

Going ahead to step 5:
1 divided by 3 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 33040.0
Subtract 0 from 1 to get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 3

Advancing to step 6:
If we divide 18 by 3, we get 6 and a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 330406.0
Subtract 18 from 18 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
3 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 330406.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
0 divided by 3 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 330406.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 330406.0 with a remaining 0.0.