We look at the division of 851970 by 84 
The aim is to understand the frequency of 84 in 851970.

Let's proceed to step 1:
84 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 84

Let's proceed to step 2:
When dividing 85 by 84, we get 1 with a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 84 from 85 to get 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 84

Let's proceed to step 3:
84 can be fit into 11 0 times, resulting in a remainder of 11.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtract 0 from 11 to get 11.
Append the next digit (9) from the dividend to 11 and continue with: 119 / 84

Advancing to step 4:
84 goes into 119 1 times with a remainder of 35.
Use 1 as the next digit of our solution. 
Result so far: 101.0
If we subtract 84 from 119, we get 35.
Take the next digit (7) from the dividend and append it to 35, then repeat: 357 / 84

Going ahead to step 5:
The number 84 fits into 357 4 times, leaving a remainder of 21.
The number 4 becomes the next digit in our result. 
Result so far: 1014.0
The remainder is 21 after subtracting 336 from 357.
Take the next digit (0) from the dividend and append it to 21, then repeat: 210 / 84

Let's proceed to step 6:
210 divided by 84 is 2 with a remainder of 42.
Put 2 as the next digit of the answer. 
Result so far: 10142.0
If we take 168 away from 210, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 7:
When dividing 420 by 84, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 10142.5
If we subtract 420 from 420, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
The number 84 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10142.5
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
84 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 10142.5
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 10142.5, and the remainder is 0.0.