We look at the division of 687080 by 71 
The aim is to understand the frequency of 71 in 687080.

On to step 1:
When dividing 6 by 71, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 71

Step 2:
When dividing 68 by 71, we get 0 with a remainder of 68.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 68 leaves us with 68.
Append the next digit (7) from the dividend to 68 and continue with: 687 / 71

On to step 3:
71 can be fit into 687 9 times, resulting in a remainder of 48.
The next digit of our result is 9. 
Result so far: 9.0
If we take 639 away from 687, we end up with 48.
Grab the next digit (0) from the dividend, add it to 48, then carry on: 480 / 71

Advancing to step 4:
480 divided by 71 is 6 with a remainder of 54.
Use 6 as the next digit of our solution. 
Result so far: 96.0
Subtracting 426 from 480 leaves us with 54.
Append the next digit (8) from the dividend to 54 and continue with: 548 / 71

Advancing to step 5:
548 divided by 71 is 7 with a remainder of 51.
Write down 7 as next digit of the result. 
Result so far: 967.0
If we subtract 497 from 548, we get 51.
Take the next digit (0) from the dividend and append it to 51, then repeat: 510 / 71

Let's proceed to step 6:
510 divided by 71 is 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 9677.0
Subtracting 497 from 510 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 7:
71 goes into 130 1 times with a remainder of 59.
Put 1 as the next digit of the answer. 
Result so far: 9677.1
Subtract 71 from 130 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 8:
When dividing 590 by 71, we get 8 with a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 9677.18
The remainder is 22 after subtracting 568 from 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 9:
71 goes into 220 3 times with a remainder of 7.
The next digit of our result is 3. 
Result so far: 9677.183
Subtracting 213 from 220 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 10:
If we divide 70 by 71, we get 0 and a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 9677.183
Deduct 0 from 70 and we're left 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.

Advancing to step 11:
71 goes into 700 9 times with a remainder of 61.
Record the quotient 9 as the next digit in the result. 
Result so far: 9677.18309
If we subtract 639 from 700, we get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Let's proceed to step 12:
If we divide 610 by 71, we get 8 and a remainder of 42.
The next digit of our result is 8. 
Result so far: 9677.183098
If we take 568 away from 610, 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.

Going ahead to step 13:
71 goes into 420 5 times with a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 9677.1830985
Deduct 355 from 420 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 14:
650 divided by 71 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 9677.18309859
Subtract 639 from 650 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Our division results in 9677.18309859 with a remaining 1.1e-08.