509338 ÷ 71 
The aim is to understand the frequency of 71 in 509338.

On to step 1:
71 goes into 5 0 times with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 71

Advancing to step 2:
If we divide 50 by 71, we get 0 and a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 50, we get 50.
Grab the next digit (9) from the dividend, add it to 50, then carry on: 509 / 71

Step 3:
71 goes into 509 7 times with a remainder of 12.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we subtract 497 from 509, we get 12.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 71

Advancing to step 4:
When dividing 123 by 71, we get 1 with a remainder of 52.
Put 1 as the next digit of the answer. 
Result so far: 71.0
Subtract 71 from 123 to get 52.
Fetch the next digit (3) from the dividend, attach it to 52 and continue: 523 / 71

Let's proceed to step 5:
When dividing 523 by 71, we get 7 with a remainder of 26.
The number 7 becomes the next digit in our result. 
Result so far: 717.0
If we subtract 497 from 523, we get 26.
Bring next digit (8) of the dividend behind the 26 and repeat the process: 268 / 71

Let's proceed to step 6:
The number 71 fits into 268 3 times, leaving a remainder of 55.
Use 3 as the next digit of our solution. 
Result so far: 7173.0
If we take 213 away from 268, we end up 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.

Moving on to step 7:
The number 71 fits into 550 7 times, leaving a remainder of 53.
Use 7 as the next digit of our solution. 
Result so far: 7173.7
If we subtract 497 from 550, we get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 8:
If we divide 530 by 71, we get 7 and a remainder of 33.
The next digit of our result is 7. 
Result so far: 7173.77
Subtract 497 from 530 to get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

The final outcome is 7173.77, with a leftover of 0.033.