We're dividing 621668 by 84 
The aim is to understand the frequency of 84 in 621668.

Advancing to step 1:
When dividing 6 by 84, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (2) from the dividend and append it to 6, then repeat: 62 / 84

Let's proceed to step 2:
62 divided by 84 is 0 with a remainder of 62.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 62, we get 62.
Take the next digit (1) from the dividend and append it to 62, then repeat: 621 / 84

Let's proceed to step 3:
The number 84 fits into 621 7 times, leaving a remainder of 33.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we subtract 588 from 621, we get 33.
Bring next digit (6) of the dividend behind the 33 and repeat the process: 336 / 84

Moving on to step 4:
336 divided by 84 is 4 with a remainder of 0.
The next digit of our result is 4. 
Result so far: 74.0
If we subtract 336 from 336, we get 0.
Append the next digit (6) from the dividend to 0 and continue with: 6 / 84

On to step 5:
If we divide 6 by 84, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 740.0
If we subtract 0 from 6, we get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 84

On to step 6:
84 goes into 68 0 times with a remainder of 68.
Record the quotient 0 as the next digit in the result. 
Result so far: 7400.0
If we subtract 0 from 68, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 7:
When dividing 680 by 84, we get 8 with a remainder of 8.
The next digit of our result is 8. 
Result so far: 7400.8
If we take 672 away from 680, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 8:
84 goes into 80 0 times with a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 7400.8
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 9:
The number 84 fits into 800 9 times, leaving a remainder of 44.
Record the quotient 9 as the next digit in the result. 
Result so far: 7400.809
If we subtract 756 from 800, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 10:
84 can be fit into 440 5 times, resulting in a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 7400.8095
The remainder is 20 after subtracting 420 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 11:
84 goes into 200 2 times with a remainder of 32.
The next digit of our result is 2. 
Result so far: 7400.80952
Subtracting 168 from 200 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 12:
84 goes into 320 3 times with a remainder of 68.
The number 3 becomes the next digit in our result. 
Result so far: 7400.809523
Subtracting 252 from 320 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 13:
If we divide 680 by 84, we get 8 and a remainder of 8.
The next digit of our result is 8. 
Result so far: 7400.8095238
If we take 672 away from 680, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 14:
84 goes into 80 0 times with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 7400.8095238
Subtracting 0 from 80 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The quotient of the division is 7400.8095238, and the remainder is 8e-08.