401409 divided by 99 
The aim is to understand the frequency of 99 in 401409.

On to step 1:
99 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 99

On to step 2:
If we divide 40 by 99, we get 0 and a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 40 after subtracting 0 from 40.
Bring next digit (1) of the dividend behind the 40 and repeat the process: 401 / 99

Step 3:
401 divided by 99 is 4 with a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtract 396 from 401 to get 5.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 99

Advancing to step 4:
99 can be fit into 54 0 times, resulting in a remainder of 54.
Put 0 as the next digit of the answer. 
Result so far: 40.0
Deduct 0 from 54 and we're left with 54.
Bring next digit (0) of the dividend behind the 54 and repeat the process: 540 / 99

Going ahead to step 5:
99 goes into 540 5 times with a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 405.0
Subtract 495 from 540 to get 45.
Bring next digit (9) of the dividend behind the 45 and repeat the process: 459 / 99

On to step 6:
99 goes into 459 4 times with a remainder of 63.
Put 4 as the next digit of the answer. 
Result so far: 4054.0
The remainder is 63 after subtracting 396 from 459.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Going ahead to step 7:
The number 99 fits into 630 6 times, leaving a remainder of 36.
Use 6 as the next digit of our solution. 
Result so far: 4054.6
Subtracting 594 from 630 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 8:
99 goes into 360 3 times with a remainder of 63.
Put 3 as the next digit of the answer. 
Result so far: 4054.63
If we take 297 away from 360, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 9:
99 can be fit into 630 6 times, resulting in a remainder of 36.
Use 6 as the next digit of our solution. 
Result so far: 4054.636
Deduct 594 from 630 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 10:
99 can be fit into 360 3 times, resulting in a remainder of 63.
The next digit of our result is 3. 
Result so far: 4054.6363
Deduct 297 from 360 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

On to step 11:
When dividing 630 by 99, we get 6 with a remainder of 36.
Use 6 as the next digit of our solution. 
Result so far: 4054.63636
Deduct 594 from 630 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 12:
360 divided by 99 is 3 with a remainder of 63.
Record the quotient 3 as the next digit in the result. 
Result so far: 4054.636363
If we take 297 away from 360, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 13:
99 goes into 630 6 times with a remainder of 36.
Put 6 as the next digit of the answer. 
Result so far: 4054.6363636
The remainder is 36 after subtracting 594 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 14:
99 goes into 360 3 times with a remainder of 63.
Put 3 as the next digit of the answer. 
Result so far: 4054.63636363
The remainder is 63 after subtracting 297 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Our division results in 4054.63636363 with a remaining 6.3e-08.