We look at the division of 87971507 by 528 
The aim is to understand the frequency of 528 in 87971507.

Let's proceed to step 1:
If we divide 8 by 528, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 528

Step 2:
If we divide 87 by 528, we get 0 and a remainder of 87.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 87 after subtracting 0 from 87.
Include the next digit (9) from the dividend after 87, then repeat: 879 / 528

Step 3:
528 goes into 879 1 times with a remainder of 351.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 528 from 879 to get 351.
Grab the next digit (7) from the dividend, add it to 351, then carry on: 3517 / 528

Advancing to step 4:
If we divide 3517 by 528, we get 6 and a remainder of 349.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Deduct 3168 from 3517 and we're left with 349.
Bring next digit (1) of the dividend behind the 349 and repeat the process: 3491 / 528

Advancing to step 5:
The number 528 fits into 3491 6 times, leaving a remainder of 323.
The number 6 becomes the next digit in our result. 
Result so far: 166.0
The remainder is 323 after subtracting 3168 from 3491.
Grab the next digit (5) from the dividend, add it to 323, then carry on: 3235 / 528

On to step 6:
528 goes into 3235 6 times with a remainder of 67.
Put 6 as the next digit of the answer. 
Result so far: 1666.0
If we take 3168 away from 3235, we end up with 67.
Append the next digit (0) from the dividend to 67 and continue with: 670 / 528

Going ahead to step 7:
528 goes into 670 1 times with a remainder of 142.
Record the quotient 1 as the next digit in the result. 
Result so far: 16661.0
Subtracting 528 from 670 leaves us with 142.
Take the next digit (7) from the dividend and append it to 142, then repeat: 1427 / 528

Step 8:
If we divide 1427 by 528, we get 2 and a remainder of 371.
Write down 2 as next digit of the result. 
Result so far: 166612.0
The remainder is 371 after subtracting 1056 from 1427.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3710, and continue the process.

Moving on to step 9:
If we divide 3710 by 528, we get 7 and a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 166612.7
If we take 3696 away from 3710, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 10:
The number 528 fits into 140 0 times, leaving a remainder of 140.
Write down 0 as next digit of the result. 
Result so far: 166612.7
Subtracting 0 from 140 leaves us with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 11:
528 goes into 1400 2 times with a remainder of 344.
The number 2 becomes the next digit in our result. 
Result so far: 166612.702
If we take 1056 away from 1400, we end up with 344.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3440, and continue the process.

Advancing to step 12:
When dividing 3440 by 528, we get 6 with a remainder of 272.
Use 6 as the next digit of our solution. 
Result so far: 166612.7026
Subtract 3168 from 3440 to get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

On to step 13:
If we divide 2720 by 528, we get 5 and a remainder of 80.
Use 5 as the next digit of our solution. 
Result so far: 166612.70265
The remainder is 80 after subtracting 2640 from 2720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 14:
When dividing 800 by 528, we get 1 with a remainder of 272.
The next digit of our result is 1. 
Result so far: 166612.702651
If we take 528 away from 800, we end up with 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Step 15:
528 can be fit into 2720 5 times, resulting in a remainder of 80.
Write down 5 as next digit of the result. 
Result so far: 166612.7026515
The remainder is 80 after subtracting 2640 from 2720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 16:
528 goes into 800 1 times with a remainder of 272.
Write down 1 as next digit of the result. 
Result so far: 166612.70265151
Subtract 528 from 800 to get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

The quotient of the division is 166612.70265151, and the remainder is 2.72e-07.