We look at the division of 436120 by 51 
The aim is to understand the frequency of 51 in 436120.

Step 1:
4 divided by 51 is 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 51

Going ahead to step 2:
43 divided by 51 is 0 with a remainder of 43.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 43, we end up with 43.
Take the next digit (6) from the dividend and append it to 43, then repeat: 436 / 51

On to step 3:
If we divide 436 by 51, we get 8 and a remainder of 28.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
The remainder is 28 after subtracting 408 from 436.
Append the next digit (1) from the dividend to 28 and continue with: 281 / 51

Let's proceed to step 4:
When dividing 281 by 51, we get 5 with a remainder of 26.
The number 5 becomes the next digit in our result. 
Result so far: 85.0
Subtract 255 from 281 to get 26.
Fetch the next digit (2) from the dividend, attach it to 26 and continue: 262 / 51

Going ahead to step 5:
51 goes into 262 5 times with a remainder of 7.
Use 5 as the next digit of our solution. 
Result so far: 855.0
Deduct 255 from 262 and we're left with 7.
Grab the next digit (0) from the dividend, add it to 7, then carry on: 70 / 51

Going ahead to step 6:
The number 51 fits into 70 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 8551.0
Subtract 51 from 70 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 7:
When dividing 190 by 51, we get 3 with a remainder of 37.
Write down 3 as next digit of the result. 
Result so far: 8551.3
The remainder is 37 after subtracting 153 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 8:
51 can be fit into 370 7 times, resulting in a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 8551.37
Subtract 357 from 370 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 9:
51 can be fit into 130 2 times, resulting in a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 8551.372
Deduct 102 from 130 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 10:
280 divided by 51 is 5 with a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 8551.3725
Deduct 255 from 280 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 11:
If we divide 250 by 51, we get 4 and a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 8551.37254
Deduct 204 from 250 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Advancing to step 12:
51 goes into 460 9 times with a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 8551.372549
If we take 459 away from 460, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 13:
51 can be fit into 10 0 times, resulting in a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 8551.372549
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 14:
The number 51 fits into 100 1 times, leaving a remainder of 49.
Record the quotient 1 as the next digit in the result. 
Result so far: 8551.37254901
Subtract 51 from 100 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

The final outcome is 8551.37254901, with a leftover of 4.9e-08.