509878 divided by 84 
The aim is to understand the frequency of 84 in 509878.

Going ahead to step 1:
84 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (0) from the dividend, add it to 5, then carry on: 50 / 84

On to step 2:
50 divided by 84 is 0 with a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 50 to get 50.
Fetch the next digit (9) from the dividend, attach it to 50 and continue: 509 / 84

Moving on to step 3:
When dividing 509 by 84, we get 6 with a remainder of 5.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 504 away from 509, we end up with 5.
Bring next digit (8) of the dividend behind the 5 and repeat the process: 58 / 84

Moving on to step 4:
84 can be fit into 58 0 times, resulting in a remainder of 58.
Use 0 as the next digit of our solution. 
Result so far: 60.0
If we subtract 0 from 58, we get 58.
Fetch the next digit (7) from the dividend, attach it to 58 and continue: 587 / 84

On to step 5:
The number 84 fits into 587 6 times, leaving a remainder of 83.
Record the quotient 6 as the next digit in the result. 
Result so far: 606.0
If we subtract 504 from 587, we get 83.
Grab the next digit (8) from the dividend, add it to 83, then carry on: 838 / 84

On to step 6:
838 divided by 84 is 9 with a remainder of 82.
The number 9 becomes the next digit in our result. 
Result so far: 6069.0
Subtract 756 from 838 to get 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 7:
84 goes into 820 9 times with a remainder of 64.
The next digit of our result is 9. 
Result so far: 6069.9
If we take 756 away from 820, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 8:
The number 84 fits into 640 7 times, leaving a remainder of 52.
Put 7 as the next digit of the answer. 
Result so far: 6069.97
If we subtract 588 from 640, we get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 9:
84 can be fit into 520 6 times, resulting in a remainder of 16.
Record the quotient 6 as the next digit in the result. 
Result so far: 6069.976
The remainder is 16 after subtracting 504 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 10:
84 can be fit into 160 1 times, resulting in a remainder of 76.
The next digit of our result is 1. 
Result so far: 6069.9761
Subtracting 84 from 160 leaves us with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 11:
If we divide 760 by 84, we get 9 and a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 6069.97619
If we subtract 756 from 760, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 12:
84 can be fit into 40 0 times, resulting in a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 6069.97619
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 13:
84 goes into 400 4 times with a remainder of 64.
The next digit of our result is 4. 
Result so far: 6069.9761904
The remainder is 64 after subtracting 336 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 14:
When dividing 640 by 84, we get 7 with a remainder of 52.
Use 7 as the next digit of our solution. 
Result so far: 6069.97619047
The remainder is 52 after subtracting 588 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Our division results in 6069.97619047 with a remaining 5.2e-08.