61323819 ÷ 521 
The aim is to understand the frequency of 521 in 61323819.

On to step 1:
The number 521 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 521

Advancing to step 2:
The number 521 fits into 61 0 times, leaving a remainder of 61.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 61, we get 61.
Take the next digit (3) from the dividend and append it to 61, then repeat: 613 / 521

On to step 3:
613 divided by 521 is 1 with a remainder of 92.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 521 away from 613, we end up with 92.
Include the next digit (2) from the dividend after 92, then repeat: 922 / 521

Step 4:
521 goes into 922 1 times with a remainder of 401.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
The remainder is 401 after subtracting 521 from 922.
Take the next digit (3) from the dividend and append it to 401, then repeat: 4013 / 521

Step 5:
4013 divided by 521 is 7 with a remainder of 366.
The number 7 becomes the next digit in our result. 
Result so far: 117.0
Deduct 3647 from 4013 and we're left with 366.
Fetch the next digit (8) from the dividend, attach it to 366 and continue: 3668 / 521

Advancing to step 6:
3668 divided by 521 is 7 with a remainder of 21.
Use 7 as the next digit of our solution. 
Result so far: 1177.0
Subtract 3647 from 3668 to get 21.
Append the next digit (1) from the dividend to 21 and continue with: 211 / 521

Advancing to step 7:
521 goes into 211 0 times with a remainder of 211.
Record the quotient 0 as the next digit in the result. 
Result so far: 11770.0
Subtract 0 from 211 to get 211.
Include the next digit (9) from the dividend after 211, then repeat: 2119 / 521

On to step 8:
2119 divided by 521 is 4 with a remainder of 35.
Put 4 as the next digit of the answer. 
Result so far: 117704.0
Subtracting 2084 from 2119 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.

Moving on to step 9:
If we divide 350 by 521, we get 0 and a remainder of 350.
Record the quotient 0 as the next digit in the result. 
Result so far: 117704.0
Deduct 0 from 350 and we're left with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Moving on to step 10:
When dividing 3500 by 521, we get 6 with a remainder of 374.
Put 6 as the next digit of the answer. 
Result so far: 117704.06
Deduct 3126 from 3500 and we're left with 374.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3740, and continue the process.

Going ahead to step 11:
The number 521 fits into 3740 7 times, leaving a remainder of 93.
The number 7 becomes the next digit in our result. 
Result so far: 117704.067
Subtract 3647 from 3740 to get 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Moving on to step 12:
The number 521 fits into 930 1 times, leaving a remainder of 409.
Record the quotient 1 as the next digit in the result. 
Result so far: 117704.0671
The remainder is 409 after subtracting 521 from 930.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4090, and continue the process.

Let's proceed to step 13:
521 goes into 4090 7 times with a remainder of 443.
The number 7 becomes the next digit in our result. 
Result so far: 117704.06717
Subtract 3647 from 4090 to get 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

Step 14:
The number 521 fits into 4430 8 times, leaving a remainder of 262.
The number 8 becomes the next digit in our result. 
Result so far: 117704.067178
The remainder is 262 after subtracting 4168 from 4430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

On to step 15:
The number 521 fits into 2620 5 times, leaving a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 117704.0671785
Subtracting 2605 from 2620 leaves us 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 16:
If we divide 150 by 521, we get 0 and a remainder of 150.
Put 0 as the next digit of the answer. 
Result so far: 117704.0671785
If we subtract 0 from 150, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Our division results in 117704.0671785 with a remaining 1.5e-07.