We look at the division of 51783071 by 451 
The aim is to understand the frequency of 451 in 51783071.

On to step 1:
When dividing 5 by 451, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 451

Advancing to step 2:
451 goes into 51 0 times with a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 51 after subtracting 0 from 51.
Append the next digit (7) from the dividend to 51 and continue with: 517 / 451

Advancing to step 3:
The number 451 fits into 517 1 times, leaving a remainder of 66.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 451 from 517, we get 66.
Bring next digit (8) of the dividend behind the 66 and repeat the process: 668 / 451

Let's proceed to step 4:
When dividing 668 by 451, we get 1 with a remainder of 217.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
If we subtract 451 from 668, we get 217.
Include the next digit (3) from the dividend after 217, then repeat: 2173 / 451

Step 5:
When dividing 2173 by 451, we get 4 with a remainder of 369.
Use 4 as the next digit of our solution. 
Result so far: 114.0
If we take 1804 away from 2173, we end up with 369.
Append the next digit (0) from the dividend to 369 and continue with: 3690 / 451

Step 6:
451 goes into 3690 8 times with a remainder of 82.
The number 8 becomes the next digit in our result. 
Result so far: 1148.0
If we take 3608 away from 3690, we end up with 82.
Include the next digit (7) from the dividend after 82, then repeat: 827 / 451

Moving on to step 7:
The number 451 fits into 827 1 times, leaving a remainder of 376.
Use 1 as the next digit of our solution. 
Result so far: 11481.0
Subtracting 451 from 827 leaves us with 376.
Take the next digit (1) from the dividend and append it to 376, then repeat: 3761 / 451

On to step 8:
3761 divided by 451 is 8 with a remainder of 153.
Put 8 as the next digit of the answer. 
Result so far: 114818.0
Subtract 3608 from 3761 to get 153.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1530, and continue the process.

Let's proceed to step 9:
The number 451 fits into 1530 3 times, leaving a remainder of 177.
The next digit of our result is 3. 
Result so far: 114818.3
Deduct 1353 from 1530 and we're left with 177.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1770, and continue the process.

On to step 10:
451 goes into 1770 3 times with a remainder of 417.
The next digit of our result is 3. 
Result so far: 114818.33
If we take 1353 away from 1770, we end up with 417.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4170, and continue the process.

After the division, we end up with 114818.33 and a remainder of 0.417.