97781132 divided by 521 
The aim is to understand the frequency of 521 in 97781132.

On to step 1:
9 divided by 521 is 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Take the next digit (7) from the dividend and append it to 9, then repeat: 97 / 521

Advancing to step 2:
If we divide 97 by 521, we get 0 and a remainder of 97.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 97, we end up with 97.
Append the next digit (7) from the dividend to 97 and continue with: 977 / 521

Step 3:
If we divide 977 by 521, we get 1 and a remainder of 456.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 521 from 977, we get 456.
Append the next digit (8) from the dividend to 456 and continue with: 4568 / 521

Step 4:
521 goes into 4568 8 times with a remainder of 400.
Use 8 as the next digit of our solution. 
Result so far: 18.0
Subtract 4168 from 4568 to get 400.
Bring next digit (1) of the dividend behind the 400 and repeat the process: 4001 / 521

On to step 5:
4001 divided by 521 is 7 with a remainder of 354.
Record the quotient 7 as the next digit in the result. 
Result so far: 187.0
Deduct 3647 from 4001 and we're left with 354.
Append the next digit (1) from the dividend to 354 and continue with: 3541 / 521

Let's proceed to step 6:
521 can be fit into 3541 6 times, resulting in a remainder of 415.
Write down 6 as next digit of the result. 
Result so far: 1876.0
Subtracting 3126 from 3541 leaves us with 415.
Fetch the next digit (3) from the dividend, attach it to 415 and continue: 4153 / 521

Going ahead to step 7:
4153 divided by 521 is 7 with a remainder of 506.
Record the quotient 7 as the next digit in the result. 
Result so far: 18767.0
Subtract 3647 from 4153 to get 506.
Bring next digit (2) of the dividend behind the 506 and repeat the process: 5062 / 521

On to step 8:
521 can be fit into 5062 9 times, resulting in a remainder of 373.
Write down 9 as next digit of the result. 
Result so far: 187679.0
If we take 4689 away from 5062, we end up with 373.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3730, and continue the process.

Going ahead to step 9:
If we divide 3730 by 521, we get 7 and a remainder of 83.
Write down 7 as next digit of the result. 
Result so far: 187679.7
Subtract 3647 from 3730 to get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Step 10:
521 can be fit into 830 1 times, resulting in a remainder of 309.
Record the quotient 1 as the next digit in the result. 
Result so far: 187679.71
If we subtract 521 from 830, we get 309.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3090, and continue the process.

On to step 11:
521 goes into 3090 5 times with a remainder of 485.
The number 5 becomes the next digit in our result. 
Result so far: 187679.715
The remainder is 485 after subtracting 2605 from 3090.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4850, and continue the process.

Advancing to step 12:
The number 521 fits into 4850 9 times, leaving a remainder of 161.
Write down 9 as next digit of the result. 
Result so far: 187679.7159
If we take 4689 away from 4850, we end up with 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Moving on to step 13:
When dividing 1610 by 521, we get 3 with a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 187679.71593
If we subtract 1563 from 1610, we 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.

Going ahead to step 14:
521 goes into 470 0 times with a remainder of 470.
The number 0 becomes the next digit in our result. 
Result so far: 187679.71593
If we subtract 0 from 470, we get 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Going ahead to step 15:
4700 divided by 521 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 187679.7159309
Deduct 4689 from 4700 and we're left 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.

Moving on to step 16:
521 goes into 110 0 times with a remainder of 110.
Write down 0 as next digit of the result. 
Result so far: 187679.7159309
The remainder is 110 after subtracting 0 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

The final outcome is 187679.7159309, with a leftover of 1.1e-07.