51681200 ÷ 231 
The aim is to understand the frequency of 231 in 51681200.

Moving on to step 1:
231 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 231

Moving on to step 2:
If we divide 51 by 231, we get 0 and a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Bring next digit (6) of the dividend behind the 51 and repeat the process: 516 / 231

Moving on to step 3:
When dividing 516 by 231, we get 2 with a remainder of 54.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 462 from 516, we get 54.
Include the next digit (8) from the dividend after 54, then repeat: 548 / 231

Let's proceed to step 4:
548 divided by 231 is 2 with a remainder of 86.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
Deduct 462 from 548 and we're left with 86.
Bring next digit (1) of the dividend behind the 86 and repeat the process: 861 / 231

Step 5:
When dividing 861 by 231, we get 3 with a remainder of 168.
Put 3 as the next digit of the answer. 
Result so far: 223.0
Deduct 693 from 861 and we're left with 168.
Fetch the next digit (2) from the dividend, attach it to 168 and continue: 1682 / 231

On to step 6:
1682 divided by 231 is 7 with a remainder of 65.
Record the quotient 7 as the next digit in the result. 
Result so far: 2237.0
The remainder is 65 after subtracting 1617 from 1682.
Include the next digit (0) from the dividend after 65, then repeat: 650 / 231

Step 7:
231 goes into 650 2 times with a remainder of 188.
Write down 2 as next digit of the result. 
Result so far: 22372.0
Deduct 462 from 650 and we're left with 188.
Include the next digit (0) from the dividend after 188, then repeat: 1880 / 231

Step 8:
231 goes into 1880 8 times with a remainder of 32.
The next digit of our result is 8. 
Result so far: 223728.0
Subtracting 1848 from 1880 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.

Step 9:
If we divide 320 by 231, we get 1 and a remainder of 89.
Put 1 as the next digit of the answer. 
Result so far: 223728.1
Subtracting 231 from 320 leaves us with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Moving on to step 10:
231 goes into 890 3 times with a remainder of 197.
The next digit of our result is 3. 
Result so far: 223728.13
Subtracting 693 from 890 leaves us with 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

On to step 11:
1970 divided by 231 is 8 with a remainder of 122.
Put 8 as the next digit of the answer. 
Result so far: 223728.138
If we subtract 1848 from 1970, we get 122.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1220, and continue the process.

Let's proceed to step 12:
231 can be fit into 1220 5 times, resulting in a remainder of 65.
Put 5 as the next digit of the answer. 
Result so far: 223728.1385
Subtracting 1155 from 1220 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 13:
231 can be fit into 650 2 times, resulting in a remainder of 188.
The next digit of our result is 2. 
Result so far: 223728.13852
Subtracting 462 from 650 leaves us with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Going ahead to step 14:
231 can be fit into 1880 8 times, resulting in a remainder of 32.
Put 8 as the next digit of the answer. 
Result so far: 223728.138528
Subtract 1848 from 1880 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 15:
The number 231 fits into 320 1 times, leaving a remainder of 89.
Put 1 as the next digit of the answer. 
Result so far: 223728.1385281
The remainder is 89 after subtracting 231 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Let's proceed to step 16:
890 divided by 231 is 3 with a remainder of 197.
The number 3 becomes the next digit in our result. 
Result so far: 223728.13852813
The remainder is 197 after subtracting 693 from 890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1970, and continue the process.

In conclusion, the division gives 223728.13852813 with a balance of 1.97e-07.