We divide 83194621 by 409
The aim is to understand the frequency of 409 in 83194621.

Advancing to step 1:
When dividing 8 by 409, we get 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (3) from the dividend, add it to 8, then carry on: 83 / 409

On to step 2:
The number 409 fits into 83 0 times, leaving a remainder of 83.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 83 after subtracting 0 from 83.
Grab the next digit (1) from the dividend, add it to 83, then carry on: 831 / 409

On to step 3:
The number 409 fits into 831 2 times, leaving a remainder of 13.
The next digit of our result is 2. 
Result so far: 2.0
If we take 818 away from 831, we end up with 13.
Take the next digit (9) from the dividend and append it to 13, then repeat: 139 / 409

Let's proceed to step 4:
If we divide 139 by 409, we get 0 and a remainder of 139.
Write down 0 as next digit of the result. 
Result so far: 20.0
Subtract 0 from 139 to get 139.
Take the next digit (4) from the dividend and append it to 139, then repeat: 1394 / 409

Advancing to step 5:
1394 divided by 409 is 3 with a remainder of 167.
Write down 3 as next digit of the result. 
Result so far: 203.0
If we subtract 1227 from 1394, we get 167.
Take the next digit (6) from the dividend and append it to 167, then repeat: 1676 / 409

Moving on to step 6:
When dividing 1676 by 409, we get 4 with a remainder of 40.
The next digit of our result is 4. 
Result so far: 2034.0
Subtract 1636 from 1676 to get 40.
Fetch the next digit (2) from the dividend, attach it to 40 and continue: 402 / 409

Step 7:
409 goes into 402 0 times with a remainder of 402.
Use 0 as the next digit of our solution. 
Result so far: 20340.0
Deduct 0 from 402 and we're left with 402.
Fetch the next digit (1) from the dividend, attach it to 402 and continue: 4021 / 409

On to step 8:
The number 409 fits into 4021 9 times, leaving a remainder of 340.
Record the quotient 9 as the next digit in the result. 
Result so far: 203409.0
Subtract 3681 from 4021 to get 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Let's proceed to step 9:
The number 409 fits into 3400 8 times, leaving a remainder of 128.
The next digit of our result is 8. 
Result so far: 203409.8
If we take 3272 away from 3400, we end up with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Moving on to step 10:
The number 409 fits into 1280 3 times, leaving a remainder of 53.
Write down 3 as next digit of the result. 
Result so far: 203409.83
If we subtract 1227 from 1280, we get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 11:
If we divide 530 by 409, we get 1 and a remainder of 121.
Put 1 as the next digit of the answer. 
Result so far: 203409.831
Subtracting 409 from 530 leaves us with 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

Going ahead to step 12:
409 can be fit into 1210 2 times, resulting in a remainder of 392.
The next digit of our result is 2. 
Result so far: 203409.8312
If we subtract 818 from 1210, we get 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

Going ahead to step 13:
409 goes into 3920 9 times with a remainder of 239.
Put 9 as the next digit of the answer. 
Result so far: 203409.83129
Subtract 3681 from 3920 to get 239.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2390, and continue the process.

Step 14:
2390 divided by 409 is 5 with a remainder of 345.
Write down 5 as next digit of the result. 
Result so far: 203409.831295
If we subtract 2045 from 2390, we get 345.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

Moving on to step 15:
409 goes into 3450 8 times with a remainder of 178.
The next digit of our result is 8. 
Result so far: 203409.8312958
Deduct 3272 from 3450 and we're left with 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

Going ahead to step 16:
409 goes into 1780 4 times with a remainder of 144.
Use 4 as the next digit of our solution. 
Result so far: 203409.83129584
The remainder is 144 after subtracting 1636 from 1780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

After the division, we end up with 203409.83129584 and a remainder of 1.44e-07.