We're dividing 303528 by 51 
The aim is to understand the frequency of 51 in 303528.

On to step 1:
When dividing 3 by 51, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 51

On to step 2:
51 can be fit into 30 0 times, resulting in a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 30 to get 30.
Fetch the next digit (3) from the dividend, attach it to 30 and continue: 303 / 51

Moving on to step 3:
303 divided by 51 is 5 with a remainder of 48.
Write down 5 as next digit of the result. 
Result so far: 5.0
Subtract 255 from 303 to get 48.
Take the next digit (5) from the dividend and append it to 48, then repeat: 485 / 51

Let's proceed to step 4:
51 goes into 485 9 times with a remainder of 26.
Record the quotient 9 as the next digit in the result. 
Result so far: 59.0
The remainder is 26 after subtracting 459 from 485.
Append the next digit (2) from the dividend to 26 and continue with: 262 / 51

Moving on to step 5:
The number 51 fits into 262 5 times, leaving a remainder of 7.
Use 5 as the next digit of our solution. 
Result so far: 595.0
If we subtract 255 from 262, we get 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 51

Moving on to step 6:
51 can be fit into 78 1 times, resulting in a remainder of 27.
Write down 1 as next digit of the result. 
Result so far: 5951.0
Deduct 51 from 78 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 7:
The number 51 fits into 270 5 times, leaving a remainder of 15.
The next digit of our result is 5. 
Result so far: 5951.5
The remainder is 15 after subtracting 255 from 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 8:
150 divided by 51 is 2 with a remainder of 48.
The number 2 becomes the next digit in our result. 
Result so far: 5951.52
Deduct 102 from 150 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 9:
If we divide 480 by 51, we get 9 and a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 5951.529
If we take 459 away from 480, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Let's proceed to step 10:
If we divide 210 by 51, we get 4 and a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 5951.5294
Subtracting 204 from 210 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 11:
The number 51 fits into 60 1 times, leaving a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 5951.52941
Deduct 51 from 60 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 12:
The number 51 fits into 90 1 times, leaving a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 5951.529411
Deduct 51 from 90 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Our division results in 5951.529411 with a remaining 3.9e-06.