We look at the division of 42637947 by 84 
The aim is to understand the frequency of 84 in 42637947.

On to step 1:
If we divide 4 by 84, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 84

Step 2:
84 goes into 42 0 times with a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 42 after subtracting 0 from 42.
Take the next digit (6) from the dividend and append it to 42, then repeat: 426 / 84

Advancing to step 3:
When dividing 426 by 84, we get 5 with a remainder of 6.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 420 from 426, we get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 84

Going ahead to step 4:
The number 84 fits into 63 0 times, leaving a remainder of 63.
The number 0 becomes the next digit in our result. 
Result so far: 50.0
If we take 0 away from 63, we end up with 63.
Bring next digit (7) of the dividend behind the 63 and repeat the process: 637 / 84

On to step 5:
84 can be fit into 637 7 times, resulting in a remainder of 49.
Write down 7 as next digit of the result. 
Result so far: 507.0
Deduct 588 from 637 and we're left with 49.
Grab the next digit (9) from the dividend, add it to 49, then carry on: 499 / 84

Advancing to step 6:
The number 84 fits into 499 5 times, leaving a remainder of 79.
Write down 5 as next digit of the result. 
Result so far: 5075.0
The remainder is 79 after subtracting 420 from 499.
Grab the next digit (4) from the dividend, add it to 79, then carry on: 794 / 84

On to step 7:
84 goes into 794 9 times with a remainder of 38.
Use 9 as the next digit of our solution. 
Result so far: 50759.0
If we take 756 away from 794, we end up with 38.
Bring next digit (7) of the dividend behind the 38 and repeat the process: 387 / 84

Going ahead to step 8:
When dividing 387 by 84, we get 4 with a remainder of 51.
Record the quotient 4 as the next digit in the result. 
Result so far: 507594.0
The remainder is 51 after subtracting 336 from 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Advancing to step 9:
If we divide 510 by 84, we get 6 and a remainder of 6.
Record the quotient 6 as the next digit in the result. 
Result so far: 507594.6
Deduct 504 from 510 and we're left with 6.
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 10:
If we divide 60 by 84, we get 0 and a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 507594.6
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 11:
If we divide 600 by 84, we get 7 and a remainder of 12.
The number 7 becomes the next digit in our result. 
Result so far: 507594.607
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.

Step 12:
When dividing 120 by 84, we get 1 with a remainder of 36.
Use 1 as the next digit of our solution. 
Result so far: 507594.6071
Subtract 84 from 120 to 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.

Moving on to step 13:
If we divide 360 by 84, we get 4 and a remainder of 24.
The number 4 becomes the next digit in our result. 
Result so far: 507594.60714
If we take 336 away from 360, we end up 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.

Advancing to step 14:
If we divide 240 by 84, we get 2 and a remainder of 72.
Put 2 as the next digit of the answer. 
Result so far: 507594.607142
If we subtract 168 from 240, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 15:
84 goes into 720 8 times with a remainder of 48.
Use 8 as the next digit of our solution. 
Result so far: 507594.6071428
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 16:
When dividing 480 by 84, we get 5 with a remainder of 60.
Use 5 as the next digit of our solution. 
Result so far: 507594.60714285
If we take 420 away from 480, we end up 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 507594.60714285 with a remainder of 6e-08.