212420 ÷ 99 
The aim is to understand the frequency of 99 in 212420.

Let's proceed to step 1:
2 divided by 99 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 99

Going ahead to step 2:
When dividing 21 by 99, we get 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 21, we get 21.
Include the next digit (2) from the dividend after 21, then repeat: 212 / 99

Moving on to step 3:
212 divided by 99 is 2 with a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 14 after subtracting 198 from 212.
Bring next digit (4) of the dividend behind the 14 and repeat the process: 144 / 99

Step 4:
When dividing 144 by 99, we get 1 with a remainder of 45.
The next digit of our result is 1. 
Result so far: 21.0
The remainder is 45 after subtracting 99 from 144.
Bring next digit (2) of the dividend behind the 45 and repeat the process: 452 / 99

On to step 5:
When dividing 452 by 99, we get 4 with a remainder of 56.
Record the quotient 4 as the next digit in the result. 
Result so far: 214.0
If we subtract 396 from 452, we get 56.
Take the next digit (0) from the dividend and append it to 56, then repeat: 560 / 99

On to step 6:
99 can be fit into 560 5 times, resulting in a remainder of 65.
Use 5 as the next digit of our solution. 
Result so far: 2145.0
Deduct 495 from 560 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 7:
650 divided by 99 is 6 with a remainder of 56.
Record the quotient 6 as the next digit in the result. 
Result so far: 2145.6
If we take 594 away from 650, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 8:
When dividing 560 by 99, we get 5 with a remainder of 65.
The next digit of our result is 5. 
Result so far: 2145.65
If we take 495 away from 560, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Moving on to step 9:
99 goes into 650 6 times with a remainder of 56.
The number 6 becomes the next digit in our result. 
Result so far: 2145.656
If we subtract 594 from 650, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 10:
The number 99 fits into 560 5 times, leaving a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 2145.6565
Deduct 495 from 560 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 11:
When dividing 650 by 99, we get 6 with a remainder of 56.
Put 6 as the next digit of the answer. 
Result so far: 2145.65656
If we subtract 594 from 650, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 12:
When dividing 560 by 99, we get 5 with a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 2145.656565
The remainder is 65 after subtracting 495 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 13:
The number 99 fits into 650 6 times, leaving a remainder of 56.
Put 6 as the next digit of the answer. 
Result so far: 2145.6565656
The remainder is 56 after subtracting 594 from 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 14:
99 can be fit into 560 5 times, resulting in a remainder of 65.
The next digit of our result is 5. 
Result so far: 2145.65656565
Deduct 495 from 560 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

The final outcome is 2145.65656565, with a leftover of 6.5e-08.