We're dividing 870637 by 71 
The aim is to understand the frequency of 71 in 870637.

On to step 1:
When dividing 8 by 71, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 71

Let's proceed to step 2:
If we divide 87 by 71, we get 1 and a remainder of 16.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 16 after subtracting 71 from 87.
Grab the next digit (0) from the dividend, add it to 16, then carry on: 160 / 71

Step 3:
71 can be fit into 160 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
If we subtract 142 from 160, we get 18.
Append the next digit (6) from the dividend to 18 and continue with: 186 / 71

Going ahead to step 4:
If we divide 186 by 71, we get 2 and a remainder of 44.
Use 2 as the next digit of our solution. 
Result so far: 122.0
The remainder is 44 after subtracting 142 from 186.
Bring next digit (3) of the dividend behind the 44 and repeat the process: 443 / 71

On to step 5:
71 goes into 443 6 times with a remainder of 17.
Put 6 as the next digit of the answer. 
Result so far: 1226.0
Subtract 426 from 443 to get 17.
Take the next digit (7) from the dividend and append it to 17, then repeat: 177 / 71

Advancing to step 6:
The number 71 fits into 177 2 times, leaving a remainder of 35.
Use 2 as the next digit of our solution. 
Result so far: 12262.0
If we take 142 away from 177, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 7:
350 divided by 71 is 4 with a remainder of 66.
Put 4 as the next digit of the answer. 
Result so far: 12262.4
Subtracting 284 from 350 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 8:
71 can be fit into 660 9 times, resulting in a remainder of 21.
The number 9 becomes the next digit in our result. 
Result so far: 12262.49
The remainder is 21 after subtracting 639 from 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 9:
If we divide 210 by 71, we get 2 and a remainder of 68.
Use 2 as the next digit of our solution. 
Result so far: 12262.492
If we take 142 away from 210, we end up 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 10:
The number 71 fits into 680 9 times, leaving a remainder of 41.
Put 9 as the next digit of the answer. 
Result so far: 12262.4929
If we subtract 639 from 680, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 11:
71 goes into 410 5 times with a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 12262.49295
Subtracting 355 from 410 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Going ahead to step 12:
When dividing 550 by 71, we get 7 with a remainder of 53.
The number 7 becomes the next digit in our result. 
Result so far: 12262.492957
Subtracting 497 from 550 leaves us with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 13:
530 divided by 71 is 7 with a remainder of 33.
Write down 7 as next digit of the result. 
Result so far: 12262.4929577
Deduct 497 from 530 and we're left with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

In conclusion, the division gives 12262.4929577 with a balance of 3.3e-07.