51335455 ÷ 4 
The aim is to understand the frequency of 4 in 51335455.

Step 1:
4 goes into 5 1 times with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 1 after subtracting 4 from 5.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 4

Step 2:
4 goes into 11 2 times with a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtracting 8 from 11 leaves us with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 4

On to step 3:
4 goes into 33 8 times with a remainder of 1.
Write down 8 as next digit of the result. 
Result so far: 128.0
The remainder is 1 after subtracting 32 from 33.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 4

Going ahead to step 4:
If we divide 13 by 4, we get 3 and a remainder of 1.
The next digit of our result is 3. 
Result so far: 1283.0
The remainder is 1 after subtracting 12 from 13.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 4

Step 5:
If we divide 15 by 4, we get 3 and a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 12833.0
Deduct 12 from 15 and we're left with 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 4

Moving on to step 6:
4 can be fit into 34 8 times, resulting in a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 128338.0
The remainder is 2 after subtracting 32 from 34.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 4

On to step 7:
4 can be fit into 25 6 times, resulting in a remainder of 1.
Put 6 as the next digit of the answer. 
Result so far: 1283386.0
If we take 24 away from 25, we end up with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 4

Advancing to step 8:
4 can be fit into 15 3 times, resulting in a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 12833863.0
If we take 12 away from 15, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 9:
30 divided by 4 is 7 with a remainder of 2.
The next digit of our result is 7. 
Result so far: 12833863.7
If we subtract 28 from 30, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 10:
4 can be fit into 20 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 12833863.75
If we take 20 away from 20, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 11:
When dividing 0 by 4, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 12833863.75
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 12:
4 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 12833863.75
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 12833863.75 with a remaining 0.0.