668324 ÷ 3 
The aim is to understand the frequency of 3 in 668324.

Let's proceed to step 1:
3 can be fit into 6 2 times, resulting in a remainder of 0.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 6 from 6, we get 0.
Append the next digit (6) from the dividend to 0 and continue with: 6 / 3

Advancing to step 2:
6 divided by 3 is 2 with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 22.0
Subtract 6 from 6 to get 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 3

Moving on to step 3:
When dividing 8 by 3, we get 2 with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 222.0
Subtract 6 from 8 to get 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 3

Going ahead to step 4:
The number 3 fits into 23 7 times, leaving a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 2227.0
Subtract 21 from 23 to get 2.
Take the next digit (2) from the dividend and append it to 2, then repeat: 22 / 3

Let's proceed to step 5:
The number 3 fits into 22 7 times, leaving a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 22277.0
If we take 21 away from 22, we end up with 1.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 3

Step 6:
3 can be fit into 14 4 times, resulting in a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 222774.0
Subtract 12 from 14 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
3 can be fit into 20 6 times, resulting in a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 222774.6
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
3 can be fit into 20 6 times, resulting in a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 222774.66
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Our division results in 222774.66 with a remaining 0.002.