We're dividing 345709 by 84 
The aim is to understand the frequency of 84 in 345709.

On to step 1:
84 can be fit into 3 0 times, resulting in a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Grab the next digit (4) from the dividend, add it to 3, then carry on: 34 / 84

Let's proceed to step 2:
34 divided by 84 is 0 with a remainder of 34.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 34 and we're left with 34.
Take the next digit (5) from the dividend and append it to 34, then repeat: 345 / 84

Going ahead to step 3:
If we divide 345 by 84, we get 4 and a remainder of 9.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 336 away from 345, we end up with 9.
Bring next digit (7) of the dividend behind the 9 and repeat the process: 97 / 84

On to step 4:
84 goes into 97 1 times with a remainder of 13.
Use 1 as the next digit of our solution. 
Result so far: 41.0
Subtract 84 from 97 to get 13.
Bring next digit (0) of the dividend behind the 13 and repeat the process: 130 / 84

Let's proceed to step 5:
The number 84 fits into 130 1 times, leaving a remainder of 46.
The number 1 becomes the next digit in our result. 
Result so far: 411.0
Subtract 84 from 130 to get 46.
Take the next digit (9) from the dividend and append it to 46, then repeat: 469 / 84

On to step 6:
84 goes into 469 5 times with a remainder of 49.
The next digit of our result is 5. 
Result so far: 4115.0
If we subtract 420 from 469, we get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Moving on to step 7:
If we divide 490 by 84, we get 5 and a remainder of 70.
Record the quotient 5 as the next digit in the result. 
Result so far: 4115.5
The remainder is 70 after subtracting 420 from 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 8:
700 divided by 84 is 8 with a remainder of 28.
Record the quotient 8 as the next digit in the result. 
Result so far: 4115.58
Subtracting 672 from 700 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 9:
When dividing 280 by 84, we get 3 with a remainder of 28.
Record the quotient 3 as the next digit in the result. 
Result so far: 4115.583
Deduct 252 from 280 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 10:
84 can be fit into 280 3 times, resulting in a remainder of 28.
Put 3 as the next digit of the answer. 
Result so far: 4115.5833
Deduct 252 from 280 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

After the division, we end up with 4115.5833 and a remainder of 0.00028.