We look at the division of 493863 by 51 
The aim is to understand the frequency of 51 in 493863.

Going ahead to step 1:
4 divided by 51 is 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Grab the next digit (9) from the dividend, add it to 4, then carry on: 49 / 51

Step 2:
51 can be fit into 49 0 times, resulting in a remainder of 49.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 49, we end up with 49.
Append the next digit (3) from the dividend to 49 and continue with: 493 / 51

Going ahead to step 3:
51 can be fit into 493 9 times, resulting in a remainder of 34.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Subtract 459 from 493 to get 34.
Append the next digit (8) from the dividend to 34 and continue with: 348 / 51

Let's proceed to step 4:
When dividing 348 by 51, we get 6 with a remainder of 42.
Put 6 as the next digit of the answer. 
Result so far: 96.0
The remainder is 42 after subtracting 306 from 348.
Append the next digit (6) from the dividend to 42 and continue with: 426 / 51

Let's proceed to step 5:
426 divided by 51 is 8 with a remainder of 18.
Write down 8 as next digit of the result. 
Result so far: 968.0
Deduct 408 from 426 and we're left with 18.
Fetch the next digit (3) from the dividend, attach it to 18 and continue: 183 / 51

Advancing to step 6:
When dividing 183 by 51, we get 3 with a remainder of 30.
Put 3 as the next digit of the answer. 
Result so far: 9683.0
If we subtract 153 from 183, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 7:
The number 51 fits into 300 5 times, leaving a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 9683.5
Subtracting 255 from 300 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 8:
51 can be fit into 450 8 times, resulting in a remainder of 42.
Record the quotient 8 as the next digit in the result. 
Result so far: 9683.58
If we subtract 408 from 450, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 9:
When dividing 420 by 51, we get 8 with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 9683.588
If we take 408 away from 420, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 9683.588 and a remainder of 0.0012.