We look at the division of 886421 by 51 
The aim is to understand the frequency of 51 in 886421.

Going ahead to step 1:
The number 51 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 51

Moving on to step 2:
The number 51 fits into 88 1 times, leaving a remainder of 37.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 51 from 88 and we're left with 37.
Bring next digit (6) of the dividend behind the 37 and repeat the process: 376 / 51

Step 3:
51 goes into 376 7 times with a remainder of 19.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
If we subtract 357 from 376, we get 19.
Bring next digit (4) of the dividend behind the 19 and repeat the process: 194 / 51

Let's proceed to step 4:
194 divided by 51 is 3 with a remainder of 41.
Record the quotient 3 as the next digit in the result. 
Result so far: 173.0
If we subtract 153 from 194, we get 41.
Include the next digit (2) from the dividend after 41, then repeat: 412 / 51

Let's proceed to step 5:
When dividing 412 by 51, we get 8 with a remainder of 4.
The next digit of our result is 8. 
Result so far: 1738.0
Deduct 408 from 412 and we're left with 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 51

Let's proceed to step 6:
51 can be fit into 41 0 times, resulting in a remainder of 41.
Record the quotient 0 as the next digit in the result. 
Result so far: 17380.0
The remainder is 41 after subtracting 0 from 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 7:
410 divided by 51 is 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 17380.8
Subtracting 408 from 410 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 8:
When dividing 20 by 51, we get 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 17380.8
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 9:
When dividing 200 by 51, we get 3 with a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 17380.803
If we subtract 153 from 200, we get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Moving on to step 10:
The number 51 fits into 470 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 17380.8039
Deduct 459 from 470 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 11:
The number 51 fits into 110 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 17380.80392
Deduct 102 from 110 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 12:
The number 51 fits into 80 1 times, leaving a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 17380.803921
If we take 51 away from 80, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 13:
290 divided by 51 is 5 with a remainder of 35.
The next digit of our result is 5. 
Result so far: 17380.8039215
Subtracting 255 from 290 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 14:
The number 51 fits into 350 6 times, leaving a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 17380.80392156
Deduct 306 from 350 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

After the division, we end up with 17380.80392156 and a remainder of 4.4e-08.