645969 divided by 84 
The aim is to understand the frequency of 84 in 645969.

Step 1:
84 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 84

Let's proceed to step 2:
84 goes into 64 0 times with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Fetch the next digit (5) from the dividend, attach it to 64 and continue: 645 / 84

Step 3:
When dividing 645 by 84, we get 7 with a remainder of 57.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtracting 588 from 645 leaves us with 57.
Take the next digit (9) from the dividend and append it to 57, then repeat: 579 / 84

On to step 4:
If we divide 579 by 84, we get 6 and a remainder of 75.
Write down 6 as next digit of the result. 
Result so far: 76.0
The remainder is 75 after subtracting 504 from 579.
Grab the next digit (6) from the dividend, add it to 75, then carry on: 756 / 84

Going ahead to step 5:
When dividing 756 by 84, we get 9 with a remainder of 0.
Write down 9 as next digit of the result. 
Result so far: 769.0
Deduct 756 from 756 and we're left with 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 84

Step 6:
The number 84 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 7690.0
The remainder is 9 after subtracting 0 from 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
If we divide 90 by 84, we get 1 and a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 7690.1
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 8:
84 can be fit into 60 0 times, resulting in a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 7690.1
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 9:
600 divided by 84 is 7 with a remainder of 12.
Record the quotient 7 as the next digit in the result. 
Result so far: 7690.107
Deduct 588 from 600 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 10:
If we divide 120 by 84, we get 1 and a remainder of 36.
The number 1 becomes the next digit in our result. 
Result so far: 7690.1071
If we subtract 84 from 120, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 11:
When dividing 360 by 84, we get 4 with a remainder of 24.
The next digit of our result is 4. 
Result so far: 7690.10714
Subtracting 336 from 360 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 12:
If we divide 240 by 84, we get 2 and a remainder of 72.
Record the quotient 2 as the next digit in the result. 
Result so far: 7690.107142
Deduct 168 from 240 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 13:
When dividing 720 by 84, we get 8 with a remainder of 48.
The number 8 becomes the next digit in our result. 
Result so far: 7690.1071428
Subtract 672 from 720 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 14:
The number 84 fits into 480 5 times, leaving a remainder of 60.
Put 5 as the next digit of the answer. 
Result so far: 7690.10714285
Deduct 420 from 480 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final result is 7690.10714285 with a remainder of 6e-08.