85718736 ÷ 521 
The aim is to understand the frequency of 521 in 85718736.

Going ahead to step 1:
When dividing 8 by 521, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 521

Going ahead to step 2:
The number 521 fits into 85 0 times, leaving a remainder of 85.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 85 and we're left with 85.
Bring next digit (7) of the dividend behind the 85 and repeat the process: 857 / 521

Advancing to step 3:
If we divide 857 by 521, we get 1 and a remainder of 336.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 521 from 857 and we're left with 336.
Append the next digit (1) from the dividend to 336 and continue with: 3361 / 521

Step 4:
521 can be fit into 3361 6 times, resulting in a remainder of 235.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
Subtracting 3126 from 3361 leaves us with 235.
Grab the next digit (8) from the dividend, add it to 235, then carry on: 2358 / 521

Let's proceed to step 5:
2358 divided by 521 is 4 with a remainder of 274.
The next digit of our result is 4. 
Result so far: 164.0
The remainder is 274 after subtracting 2084 from 2358.
Bring next digit (7) of the dividend behind the 274 and repeat the process: 2747 / 521

Going ahead to step 6:
521 goes into 2747 5 times with a remainder of 142.
The next digit of our result is 5. 
Result so far: 1645.0
If we subtract 2605 from 2747, we get 142.
Fetch the next digit (3) from the dividend, attach it to 142 and continue: 1423 / 521

Going ahead to step 7:
If we divide 1423 by 521, we get 2 and a remainder of 381.
Use 2 as the next digit of our solution. 
Result so far: 16452.0
If we subtract 1042 from 1423, we get 381.
Take the next digit (6) from the dividend and append it to 381, then repeat: 3816 / 521

Advancing to step 8:
The number 521 fits into 3816 7 times, leaving a remainder of 169.
Use 7 as the next digit of our solution. 
Result so far: 164527.0
Deduct 3647 from 3816 and we're left with 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

Going ahead to step 9:
1690 divided by 521 is 3 with a remainder of 127.
Use 3 as the next digit of our solution. 
Result so far: 164527.3
Subtracting 1563 from 1690 leaves us with 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Step 10:
1270 divided by 521 is 2 with a remainder of 228.
Write down 2 as next digit of the result. 
Result so far: 164527.32
The remainder is 228 after subtracting 1042 from 1270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Moving on to step 11:
521 can be fit into 2280 4 times, resulting in a remainder of 196.
Put 4 as the next digit of the answer. 
Result so far: 164527.324
Subtract 2084 from 2280 to get 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Let's proceed to step 12:
The number 521 fits into 1960 3 times, leaving a remainder of 397.
Record the quotient 3 as the next digit in the result. 
Result so far: 164527.3243
Subtracting 1563 from 1960 leaves us with 397.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3970, and continue the process.

Moving on to step 13:
521 goes into 3970 7 times with a remainder of 323.
Use 7 as the next digit of our solution. 
Result so far: 164527.32437
If we subtract 3647 from 3970, we get 323.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3230, and continue the process.

Let's proceed to step 14:
3230 divided by 521 is 6 with a remainder of 104.
Record the quotient 6 as the next digit in the result. 
Result so far: 164527.324376
Subtracting 3126 from 3230 leaves us with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

On to step 15:
If we divide 1040 by 521, we get 1 and a remainder of 519.
Put 1 as the next digit of the answer. 
Result so far: 164527.3243761
If we take 521 away from 1040, we end up with 519.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5190, and continue the process.

Moving on to step 16:
521 can be fit into 5190 9 times, resulting in a remainder of 501.
Use 9 as the next digit of our solution. 
Result so far: 164527.32437619
If we take 4689 away from 5190, we end up with 501.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5010, and continue the process.

In conclusion, the division gives 164527.32437619 with a balance of 5.01e-07.