509858 ÷ 68 
The aim is to understand the frequency of 68 in 509858.

Going ahead to step 1:
68 goes into 5 0 times with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 68

Advancing to step 2:
When dividing 50 by 68, we get 0 with a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 50 to get 50.
Append the next digit (9) from the dividend to 50 and continue with: 509 / 68

Let's proceed to step 3:
When dividing 509 by 68, we get 7 with a remainder of 33.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtract 476 from 509 to get 33.
Include the next digit (8) from the dividend after 33, then repeat: 338 / 68

Going ahead to step 4:
68 can be fit into 338 4 times, resulting in a remainder of 66.
Record the quotient 4 as the next digit in the result. 
Result so far: 74.0
Subtract 272 from 338 to get 66.
Fetch the next digit (5) from the dividend, attach it to 66 and continue: 665 / 68

Step 5:
When dividing 665 by 68, we get 9 with a remainder of 53.
Record the quotient 9 as the next digit in the result. 
Result so far: 749.0
Subtracting 612 from 665 leaves us with 53.
Fetch the next digit (8) from the dividend, attach it to 53 and continue: 538 / 68

Let's proceed to step 6:
If we divide 538 by 68, we get 7 and a remainder of 62.
Put 7 as the next digit of the answer. 
Result so far: 7497.0
Subtract 476 from 538 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 7:
When dividing 620 by 68, we get 9 with a remainder of 8.
Put 9 as the next digit of the answer. 
Result so far: 7497.9
The remainder is 8 after subtracting 612 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 8:
If we divide 80 by 68, we get 1 and a remainder of 12.
The next digit of our result is 1. 
Result so far: 7497.91
The remainder is 12 after subtracting 68 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 9:
68 goes into 120 1 times with a remainder of 52.
Use 1 as the next digit of our solution. 
Result so far: 7497.911
The remainder is 52 after subtracting 68 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

The final outcome is 7497.911, with a leftover of 0.0052.