7804206 divided by 406 
The aim is to understand the frequency of 406 in 7804206.

Let's proceed to step 1:
If we divide 7 by 406, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 406

Going ahead to step 2:
406 goes into 78 0 times with a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 78 leaves us with 78.
Append the next digit (0) from the dividend to 78 and continue with: 780 / 406

Moving on to step 3:
406 goes into 780 1 times with a remainder of 374.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 406 from 780, we get 374.
Bring next digit (4) of the dividend behind the 374 and repeat the process: 3744 / 406

Advancing to step 4:
406 goes into 3744 9 times with a remainder of 90.
The next digit of our result is 9. 
Result so far: 19.0
If we take 3654 away from 3744, we end up with 90.
Grab the next digit (2) from the dividend, add it to 90, then carry on: 902 / 406

Moving on to step 5:
902 divided by 406 is 2 with a remainder of 90.
Record the quotient 2 as the next digit in the result. 
Result so far: 192.0
If we take 812 away from 902, we end up with 90.
Include the next digit (0) from the dividend after 90, then repeat: 900 / 406

Moving on to step 6:
406 goes into 900 2 times with a remainder of 88.
Write down 2 as next digit of the result. 
Result so far: 1922.0
The remainder is 88 after subtracting 812 from 900.
Include the next digit (6) from the dividend after 88, then repeat: 886 / 406

Going ahead to step 7:
If we divide 886 by 406, we get 2 and a remainder of 74.
The number 2 becomes the next digit in our result. 
Result so far: 19222.0
If we subtract 812 from 886, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 8:
When dividing 740 by 406, we get 1 with a remainder of 334.
Put 1 as the next digit of the answer. 
Result so far: 19222.1
Subtracting 406 from 740 leaves us with 334.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3340, and continue the process.

Going ahead to step 9:
406 can be fit into 3340 8 times, resulting in a remainder of 92.
The next digit of our result is 8. 
Result so far: 19222.18
If we take 3248 away from 3340, we end up with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Let's proceed to step 10:
406 can be fit into 920 2 times, resulting in a remainder of 108.
Put 2 as the next digit of the answer. 
Result so far: 19222.182
Subtract 812 from 920 to get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Step 11:
1080 divided by 406 is 2 with a remainder of 268.
Record the quotient 2 as the next digit in the result. 
Result so far: 19222.1822
If we subtract 812 from 1080, we get 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

After the division, we end up with 19222.1822 and a remainder of 0.00268.