We look at the division of 86744908 by 523 
The aim is to understand the frequency of 523 in 86744908.

Step 1:
The number 523 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 523

Moving on to step 2:
523 can be fit into 86 0 times, resulting in a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 86 after subtracting 0 from 86.
Take the next digit (7) from the dividend and append it to 86, then repeat: 867 / 523

Let's proceed to step 3:
523 can be fit into 867 1 times, resulting in a remainder of 344.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 344 after subtracting 523 from 867.
Grab the next digit (4) from the dividend, add it to 344, then carry on: 3444 / 523

Going ahead to step 4:
If we divide 3444 by 523, we get 6 and a remainder of 306.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Deduct 3138 from 3444 and we're left with 306.
Bring next digit (4) of the dividend behind the 306 and repeat the process: 3064 / 523

On to step 5:
3064 divided by 523 is 5 with a remainder of 449.
Put 5 as the next digit of the answer. 
Result so far: 165.0
Subtracting 2615 from 3064 leaves us with 449.
Append the next digit (9) from the dividend to 449 and continue with: 4499 / 523

On to step 6:
4499 divided by 523 is 8 with a remainder of 315.
Put 8 as the next digit of the answer. 
Result so far: 1658.0
Deduct 4184 from 4499 and we're left with 315.
Fetch the next digit (0) from the dividend, attach it to 315 and continue: 3150 / 523

Advancing to step 7:
523 can be fit into 3150 6 times, resulting in a remainder of 12.
Put 6 as the next digit of the answer. 
Result so far: 16586.0
Subtracting 3138 from 3150 leaves us with 12.
Grab the next digit (8) from the dividend, add it to 12, then carry on: 128 / 523

Let's proceed to step 8:
523 goes into 128 0 times with a remainder of 128.
The number 0 becomes the next digit in our result. 
Result so far: 165860.0
If we subtract 0 from 128, we get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 9:
When dividing 1280 by 523, we get 2 with a remainder of 234.
Put 2 as the next digit of the answer. 
Result so far: 165860.2
Deduct 1046 from 1280 and we're left with 234.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2340, and continue the process.

Advancing to step 10:
523 can be fit into 2340 4 times, resulting in a remainder of 248.
The next digit of our result is 4. 
Result so far: 165860.24
Deduct 2092 from 2340 and we're left with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

On to step 11:
2480 divided by 523 is 4 with a remainder of 388.
Put 4 as the next digit of the answer. 
Result so far: 165860.244
If we subtract 2092 from 2480, we get 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

Our division results in 165860.244 with a remaining 0.0388.