66690106 divided by 84 
The aim is to understand the frequency of 84 in 66690106.

On to step 1:
6 divided by 84 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 84

Let's proceed to step 2:
If we divide 66 by 84, we get 0 and a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Grab the next digit (6) from the dividend, add it to 66, then carry on: 666 / 84

Let's proceed to step 3:
The number 84 fits into 666 7 times, leaving a remainder of 78.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we subtract 588 from 666, we get 78.
Include the next digit (9) from the dividend after 78, then repeat: 789 / 84

Step 4:
84 goes into 789 9 times with a remainder of 33.
The next digit of our result is 9. 
Result so far: 79.0
Subtract 756 from 789 to get 33.
Append the next digit (0) from the dividend to 33 and continue with: 330 / 84

Moving on to step 5:
The number 84 fits into 330 3 times, leaving a remainder of 78.
Put 3 as the next digit of the answer. 
Result so far: 793.0
If we take 252 away from 330, we end up with 78.
Fetch the next digit (1) from the dividend, attach it to 78 and continue: 781 / 84

Step 6:
When dividing 781 by 84, we get 9 with a remainder of 25.
Put 9 as the next digit of the answer. 
Result so far: 7939.0
If we take 756 away from 781, we end up with 25.
Bring next digit (0) of the dividend behind the 25 and repeat the process: 250 / 84

Moving on to step 7:
If we divide 250 by 84, we get 2 and a remainder of 82.
The next digit of our result is 2. 
Result so far: 79392.0
The remainder is 82 after subtracting 168 from 250.
Append the next digit (6) from the dividend to 82 and continue with: 826 / 84

Let's proceed to step 8:
When dividing 826 by 84, we get 9 with a remainder of 70.
Record the quotient 9 as the next digit in the result. 
Result so far: 793929.0
If we take 756 away from 826, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 9:
84 goes into 700 8 times with a remainder of 28.
The number 8 becomes the next digit in our result. 
Result so far: 793929.8
Deduct 672 from 700 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.

On to step 10:
When dividing 280 by 84, we get 3 with a remainder of 28.
Put 3 as the next digit of the answer. 
Result so far: 793929.83
Subtracting 252 from 280 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.

Step 11:
The number 84 fits into 280 3 times, leaving a remainder of 28.
Put 3 as the next digit of the answer. 
Result so far: 793929.833
If we subtract 252 from 280, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Our division results in 793929.833 with a remaining 0.0028.