We look at the division of 451569 by 51 
The aim is to understand the frequency of 51 in 451569.

On to step 1:
If we divide 4 by 51, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 51

Let's proceed to step 2:
45 divided by 51 is 0 with a remainder of 45.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 45 after subtracting 0 from 45.
Fetch the next digit (1) from the dividend, attach it to 45 and continue: 451 / 51

On to step 3:
When dividing 451 by 51, we get 8 with a remainder of 43.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtracting 408 from 451 leaves us with 43.
Take the next digit (5) from the dividend and append it to 43, then repeat: 435 / 51

Moving on to step 4:
51 can be fit into 435 8 times, resulting in a remainder of 27.
The next digit of our result is 8. 
Result so far: 88.0
Subtracting 408 from 435 leaves us with 27.
Take the next digit (6) from the dividend and append it to 27, then repeat: 276 / 51

On to step 5:
The number 51 fits into 276 5 times, leaving a remainder of 21.
Record the quotient 5 as the next digit in the result. 
Result so far: 885.0
If we subtract 255 from 276, we get 21.
Take the next digit (9) from the dividend and append it to 21, then repeat: 219 / 51

Let's proceed to step 6:
51 can be fit into 219 4 times, resulting in a remainder of 15.
Put 4 as the next digit of the answer. 
Result so far: 8854.0
If we take 204 away from 219, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 7:
51 goes into 150 2 times with a remainder of 48.
The number 2 becomes the next digit in our result. 
Result so far: 8854.2
If we take 102 away from 150, we end up 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 8:
The number 51 fits into 480 9 times, leaving a remainder of 21.
Record the quotient 9 as the next digit in the result. 
Result so far: 8854.29
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 9:
The number 51 fits into 210 4 times, leaving a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 8854.294
If we take 204 away from 210, we end up 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.

Moving on to step 10:
60 divided by 51 is 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 8854.2941
If we subtract 51 from 60, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 11:
90 divided by 51 is 1 with a remainder of 39.
The number 1 becomes the next digit in our result. 
Result so far: 8854.29411
If we subtract 51 from 90, we get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The final outcome is 8854.29411, with a leftover of 3.9e-05.