We look at the division of 507681 by 71 
The aim is to understand the frequency of 71 in 507681.

Advancing to step 1:
When dividing 5 by 71, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (0) of the dividend behind the 5 and repeat the process: 50 / 71

Let's proceed to step 2:
50 divided by 71 is 0 with a remainder of 50.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 50 leaves us with 50.
Include the next digit (7) from the dividend after 50, then repeat: 507 / 71

On to step 3:
If we divide 507 by 71, we get 7 and a remainder of 10.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we take 497 away from 507, we end up with 10.
Bring next digit (6) of the dividend behind the 10 and repeat the process: 106 / 71

Step 4:
If we divide 106 by 71, we get 1 and a remainder of 35.
The number 1 becomes the next digit in our result. 
Result so far: 71.0
If we take 71 away from 106, we end up with 35.
Fetch the next digit (8) from the dividend, attach it to 35 and continue: 358 / 71

On to step 5:
If we divide 358 by 71, we get 5 and a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 715.0
If we take 355 away from 358, we end up with 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 71

Going ahead to step 6:
If we divide 31 by 71, we get 0 and a remainder of 31.
Use 0 as the next digit of our solution. 
Result so far: 7150.0
Subtracting 0 from 31 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Going ahead to step 7:
71 goes into 310 4 times with a remainder of 26.
Put 4 as the next digit of the answer. 
Result so far: 7150.4
The remainder is 26 after subtracting 284 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 8:
71 can be fit into 260 3 times, resulting in a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 7150.43
Subtract 213 from 260 to get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 9:
71 goes into 470 6 times with a remainder of 44.
The next digit of our result is 6. 
Result so far: 7150.436
Deduct 426 from 470 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 10:
440 divided by 71 is 6 with a remainder of 14.
The next digit of our result is 6. 
Result so far: 7150.4366
If we take 426 away from 440, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Our division results in 7150.4366 with a remaining 0.00014.