521650 divided by 53 
The aim is to understand the frequency of 53 in 521650.

Going ahead to step 1:
When dividing 5 by 53, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 53

Let's proceed to step 2:
53 can be fit into 52 0 times, resulting in a remainder of 52.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 52 leaves us with 52.
Append the next digit (1) from the dividend to 52 and continue with: 521 / 53

Let's proceed to step 3:
If we divide 521 by 53, we get 9 and a remainder of 44.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Deduct 477 from 521 and we're left with 44.
Append the next digit (6) from the dividend to 44 and continue with: 446 / 53

Going ahead to step 4:
53 can be fit into 446 8 times, resulting in a remainder of 22.
Put 8 as the next digit of the answer. 
Result so far: 98.0
Subtracting 424 from 446 leaves us with 22.
Grab the next digit (5) from the dividend, add it to 22, then carry on: 225 / 53

Let's proceed to step 5:
When dividing 225 by 53, we get 4 with a remainder of 13.
Record the quotient 4 as the next digit in the result. 
Result so far: 984.0
Deduct 212 from 225 and we're left with 13.
Include the next digit (0) from the dividend after 13, then repeat: 130 / 53

Moving on to step 6:
When dividing 130 by 53, we get 2 with a remainder of 24.
Put 2 as the next digit of the answer. 
Result so far: 9842.0
The remainder is 24 after subtracting 106 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 7:
When dividing 240 by 53, we get 4 with a remainder of 28.
Use 4 as the next digit of our solution. 
Result so far: 9842.4
Subtracting 212 from 240 leaves us 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.

Going ahead to step 8:
When dividing 280 by 53, we get 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 9842.45
Subtract 265 from 280 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 9:
53 goes into 150 2 times with a remainder of 44.
The number 2 becomes the next digit in our result. 
Result so far: 9842.452
Subtract 106 from 150 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 10:
440 divided by 53 is 8 with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 9842.4528
Deduct 424 from 440 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 11:
160 divided by 53 is 3 with a remainder of 1.
The next digit of our result is 3. 
Result so far: 9842.45283
Deduct 159 from 160 and we're left 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.

Moving on to step 12:
When dividing 10 by 53, we get 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 9842.45283
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 13:
53 can be fit into 100 1 times, resulting in a remainder of 47.
Record the quotient 1 as the next digit in the result. 
Result so far: 9842.4528301
Deduct 53 from 100 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Step 14:
53 can be fit into 470 8 times, resulting in a remainder of 46.
Record the quotient 8 as the next digit in the result. 
Result so far: 9842.45283018
Subtracting 424 from 470 leaves us 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.

After the division, we end up with 9842.45283018 and a remainder of 4.6e-08.