We're dividing 51213992 by 54 
The aim is to understand the frequency of 54 in 51213992.

Step 1:
5 divided by 54 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 54

On to step 2:
When dividing 51 by 54, we get 0 with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Grab the next digit (2) from the dividend, add it to 51, then carry on: 512 / 54

Moving on to step 3:
The number 54 fits into 512 9 times, leaving a remainder of 26.
Write down 9 as next digit of the result. 
Result so far: 9.0
Subtract 486 from 512 to get 26.
Include the next digit (1) from the dividend after 26, then repeat: 261 / 54

Let's proceed to step 4:
The number 54 fits into 261 4 times, leaving a remainder of 45.
Put 4 as the next digit of the answer. 
Result so far: 94.0
Deduct 216 from 261 and we're left with 45.
Include the next digit (3) from the dividend after 45, then repeat: 453 / 54

Moving on to step 5:
When dividing 453 by 54, we get 8 with a remainder of 21.
Record the quotient 8 as the next digit in the result. 
Result so far: 948.0
Deduct 432 from 453 and we're left with 21.
Include the next digit (9) from the dividend after 21, then repeat: 219 / 54

Going ahead to step 6:
When dividing 219 by 54, we get 4 with a remainder of 3.
Put 4 as the next digit of the answer. 
Result so far: 9484.0
If we subtract 216 from 219, we get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 54

On to step 7:
If we divide 39 by 54, we get 0 and a remainder of 39.
The next digit of our result is 0. 
Result so far: 94840.0
Subtract 0 from 39 to get 39.
Bring next digit (2) of the dividend behind the 39 and repeat the process: 392 / 54

Advancing to step 8:
When dividing 392 by 54, we get 7 with a remainder of 14.
Use 7 as the next digit of our solution. 
Result so far: 948407.0
Subtract 378 from 392 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 9:
140 divided by 54 is 2 with a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 948407.2
Deduct 108 from 140 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 10:
When dividing 320 by 54, we get 5 with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 948407.25
Deduct 270 from 320 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 11:
If we divide 500 by 54, we get 9 and a remainder of 14.
The number 9 becomes the next digit in our result. 
Result so far: 948407.259
Subtracting 486 from 500 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 12:
The number 54 fits into 140 2 times, leaving a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 948407.2592
Subtracting 108 from 140 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 13:
If we divide 320 by 54, we get 5 and a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 948407.25925
If we take 270 away from 320, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 14:
The number 54 fits into 500 9 times, leaving a remainder of 14.
Use 9 as the next digit of our solution. 
Result so far: 948407.259259
Subtracting 486 from 500 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 15:
If we divide 140 by 54, we get 2 and a remainder of 32.
Write down 2 as next digit of the result. 
Result so far: 948407.2592592
The remainder is 32 after subtracting 108 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 16:
320 divided by 54 is 5 with a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 948407.25925925
If we subtract 270 from 320, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

After the division, we end up with 948407.25925925 and a remainder of 5e-08.