We're dividing 521837 by 51 
The aim is to understand the frequency of 51 in 521837.

Moving on to step 1:
51 can be fit into 5 0 times, resulting in a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 51

On to step 2:
The number 51 fits into 52 1 times, leaving a remainder of 1.
The next digit of our result is 1. 
Result so far: 1.0
If we take 51 away from 52, we end up with 1.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 51

Step 3:
The number 51 fits into 11 0 times, leaving a remainder of 11.
The next digit of our result is 0. 
Result so far: 10.0
If we take 0 away from 11, we end up with 11.
Append the next digit (8) from the dividend to 11 and continue with: 118 / 51

On to step 4:
If we divide 118 by 51, we get 2 and a remainder of 16.
Use 2 as the next digit of our solution. 
Result so far: 102.0
Subtracting 102 from 118 leaves us with 16.
Bring next digit (3) of the dividend behind the 16 and repeat the process: 163 / 51

Moving on to step 5:
163 divided by 51 is 3 with a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 1023.0
The remainder is 10 after subtracting 153 from 163.
Bring next digit (7) of the dividend behind the 10 and repeat the process: 107 / 51

Let's proceed to step 6:
When dividing 107 by 51, we get 2 with a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 10232.0
Deduct 102 from 107 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
51 goes into 50 0 times with a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 10232.0
Deduct 0 from 50 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 8:
51 goes into 500 9 times with a remainder of 41.
Use 9 as the next digit of our solution. 
Result so far: 10232.09
Subtracting 459 from 500 leaves us with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 9:
51 goes into 410 8 times with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 10232.098
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.

Moving on to step 10:
If we divide 20 by 51, we get 0 and a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 10232.098
Deduct 0 from 20 and we're left 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.

Going ahead to step 11:
51 goes into 200 3 times with a remainder of 47.
The next digit of our result is 3. 
Result so far: 10232.09803
Subtract 153 from 200 to 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.

On to step 12:
The number 51 fits into 470 9 times, leaving a remainder of 11.
The next digit of our result is 9. 
Result so far: 10232.098039
If we take 459 away from 470, we end up 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.

Step 13:
If we divide 110 by 51, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 10232.0980392
If we subtract 102 from 110, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 14:
If we divide 80 by 51, we get 1 and a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 10232.09803921
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.

After the division, we end up with 10232.09803921 and a remainder of 2.9e-08.