324012 ÷ 90 
The aim is to understand the frequency of 90 in 324012.

Step 1:
The number 90 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 90

Moving on to step 2:
32 divided by 90 is 0 with a remainder of 32.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 32 after subtracting 0 from 32.
Grab the next digit (4) from the dividend, add it to 32, then carry on: 324 / 90

Step 3:
90 goes into 324 3 times with a remainder of 54.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 270 from 324, we get 54.
Grab the next digit (0) from the dividend, add it to 54, then carry on: 540 / 90

Let's proceed to step 4:
90 goes into 540 6 times with a remainder of 0.
The next digit of our result is 6. 
Result so far: 36.0
If we subtract 540 from 540, we get 0.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 90

Step 5:
The number 90 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 360.0
Subtract 0 from 1 to get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 90

Step 6:
The number 90 fits into 12 0 times, leaving a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 3600.0
If we subtract 0 from 12, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 7:
When dividing 120 by 90, we get 1 with a remainder of 30.
Put 1 as the next digit of the answer. 
Result so far: 3600.1
Deduct 90 from 120 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 8:
300 divided by 90 is 3 with a remainder of 30.
Put 3 as the next digit of the answer. 
Result so far: 3600.13
Subtract 270 from 300 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 9:
If we divide 300 by 90, we get 3 and a remainder of 30.
Record the quotient 3 as the next digit in the result. 
Result so far: 3600.133
The remainder is 30 after subtracting 270 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final outcome is 3600.133, with a leftover of 0.003.