We look at the division of 999639 by 71 
The aim is to understand the frequency of 71 in 999639.

Advancing to step 1:
9 divided by 71 is 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 71

Going ahead to step 2:
The number 71 fits into 99 1 times, leaving a remainder of 28.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 71 from 99 to get 28.
Grab the next digit (9) from the dividend, add it to 28, then carry on: 289 / 71

Moving on to step 3:
If we divide 289 by 71, we get 4 and a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
If we subtract 284 from 289, we get 5.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 71

Advancing to step 4:
71 goes into 56 0 times with a remainder of 56.
Use 0 as the next digit of our solution. 
Result so far: 140.0
If we subtract 0 from 56, we get 56.
Append the next digit (3) from the dividend to 56 and continue with: 563 / 71

Moving on to step 5:
If we divide 563 by 71, we get 7 and a remainder of 66.
Put 7 as the next digit of the answer. 
Result so far: 1407.0
Subtracting 497 from 563 leaves us with 66.
Grab the next digit (9) from the dividend, add it to 66, then carry on: 669 / 71

On to step 6:
If we divide 669 by 71, we get 9 and a remainder of 30.
Put 9 as the next digit of the answer. 
Result so far: 14079.0
Subtract 639 from 669 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 7:
When dividing 300 by 71, we get 4 with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 14079.4
Subtracting 284 from 300 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 8:
71 goes into 160 2 times with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 14079.42
If we take 142 away from 160, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 9:
71 can be fit into 180 2 times, resulting in a remainder of 38.
Write down 2 as next digit of the result. 
Result so far: 14079.422
Subtract 142 from 180 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Our division results in 14079.422 with a remaining 0.0038.