409453 ÷ 84 
The aim is to understand the frequency of 84 in 409453.

Moving on to step 1:
When dividing 4 by 84, we get 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 84

On to step 2:
40 divided by 84 is 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 40 leaves us with 40.
Take the next digit (9) from the dividend and append it to 40, then repeat: 409 / 84

On to step 3:
When dividing 409 by 84, we get 4 with a remainder of 73.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtracting 336 from 409 leaves us with 73.
Append the next digit (4) from the dividend to 73 and continue with: 734 / 84

Step 4:
The number 84 fits into 734 8 times, leaving a remainder of 62.
The next digit of our result is 8. 
Result so far: 48.0
If we subtract 672 from 734, we get 62.
Append the next digit (5) from the dividend to 62 and continue with: 625 / 84

Going ahead to step 5:
If we divide 625 by 84, we get 7 and a remainder of 37.
Put 7 as the next digit of the answer. 
Result so far: 487.0
The remainder is 37 after subtracting 588 from 625.
Include the next digit (3) from the dividend after 37, then repeat: 373 / 84

Moving on to step 6:
If we divide 373 by 84, we get 4 and a remainder of 37.
Use 4 as the next digit of our solution. 
Result so far: 4874.0
If we subtract 336 from 373, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 7:
84 can be fit into 370 4 times, resulting in a remainder of 34.
Use 4 as the next digit of our solution. 
Result so far: 4874.4
The remainder is 34 after subtracting 336 from 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 8:
340 divided by 84 is 4 with a remainder of 4.
The next digit of our result is 4. 
Result so far: 4874.44
Subtracting 336 from 340 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The quotient of the division is 4874.44, and the remainder is 0.004.