20129800 ÷ 406 
The aim is to understand the frequency of 406 in 20129800.

Moving on to step 1:
2 divided by 406 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (0) from the dividend after 2, then repeat: 20 / 406

Step 2:
20 divided by 406 is 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 20, we get 20.
Bring next digit (1) of the dividend behind the 20 and repeat the process: 201 / 406

Step 3:
406 goes into 201 0 times with a remainder of 201.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 201 and we're left with 201.
Fetch the next digit (2) from the dividend, attach it to 201 and continue: 2012 / 406

Let's proceed to step 4:
If we divide 2012 by 406, we get 4 and a remainder of 388.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 1624 away from 2012, we end up with 388.
Include the next digit (9) from the dividend after 388, then repeat: 3889 / 406

Moving on to step 5:
3889 divided by 406 is 9 with a remainder of 235.
The number 9 becomes the next digit in our result. 
Result so far: 49.0
If we take 3654 away from 3889, we end up with 235.
Grab the next digit (8) from the dividend, add it to 235, then carry on: 2358 / 406

Advancing to step 6:
406 can be fit into 2358 5 times, resulting in a remainder of 328.
Use 5 as the next digit of our solution. 
Result so far: 495.0
The remainder is 328 after subtracting 2030 from 2358.
Bring next digit (0) of the dividend behind the 328 and repeat the process: 3280 / 406

Advancing to step 7:
406 goes into 3280 8 times with a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 4958.0
Deduct 3248 from 3280 and we're left with 32.
Append the next digit (0) from the dividend to 32 and continue with: 320 / 406

Moving on to step 8:
If we divide 320 by 406, we get 0 and a remainder of 320.
The number 0 becomes the next digit in our result. 
Result so far: 49580.0
If we subtract 0 from 320, we get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Moving on to step 9:
406 can be fit into 3200 7 times, resulting in a remainder of 358.
Use 7 as the next digit of our solution. 
Result so far: 49580.7
Subtract 2842 from 3200 to get 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Advancing to step 10:
If we divide 3580 by 406, we get 8 and a remainder of 332.
The next digit of our result is 8. 
Result so far: 49580.78
If we subtract 3248 from 3580, we get 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

On to step 11:
406 goes into 3320 8 times with a remainder of 72.
Record the quotient 8 as the next digit in the result. 
Result so far: 49580.788
Subtracting 3248 from 3320 leaves us with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

In conclusion, the division gives 49580.788 with a balance of 0.0072.