We look at the division of 781633 by 87 
The aim is to understand the frequency of 87 in 781633.

Advancing to step 1:
When dividing 7 by 87, we get 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 87

Moving on to step 2:
87 goes into 78 0 times with a remainder of 78.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 78, we get 78.
Fetch the next digit (1) from the dividend, attach it to 78 and continue: 781 / 87

Going ahead to step 3:
When dividing 781 by 87, we get 8 with a remainder of 85.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtracting 696 from 781 leaves us with 85.
Take the next digit (6) from the dividend and append it to 85, then repeat: 856 / 87

Going ahead to step 4:
The number 87 fits into 856 9 times, leaving a remainder of 73.
Use 9 as the next digit of our solution. 
Result so far: 89.0
The remainder is 73 after subtracting 783 from 856.
Include the next digit (3) from the dividend after 73, then repeat: 733 / 87

Step 5:
87 can be fit into 733 8 times, resulting in a remainder of 37.
The next digit of our result is 8. 
Result so far: 898.0
Subtracting 696 from 733 leaves us with 37.
Fetch the next digit (3) from the dividend, attach it to 37 and continue: 373 / 87

Let's proceed to step 6:
The number 87 fits into 373 4 times, leaving a remainder of 25.
The next digit of our result is 4. 
Result so far: 8984.0
Subtract 348 from 373 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 7:
The number 87 fits into 250 2 times, leaving a remainder of 76.
Write down 2 as next digit of the result. 
Result so far: 8984.2
If we subtract 174 from 250, we get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 8:
760 divided by 87 is 8 with a remainder of 64.
Write down 8 as next digit of the result. 
Result so far: 8984.28
Subtracting 696 from 760 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 9:
87 goes into 640 7 times with a remainder of 31.
Use 7 as the next digit of our solution. 
Result so far: 8984.287
The remainder is 31 after subtracting 609 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 10:
87 can be fit into 310 3 times, resulting in a remainder of 49.
Write down 3 as next digit of the result. 
Result so far: 8984.2873
Subtract 261 from 310 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Let's proceed to step 11:
490 divided by 87 is 5 with a remainder of 55.
Put 5 as the next digit of the answer. 
Result so far: 8984.28735
Deduct 435 from 490 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Step 12:
When dividing 550 by 87, we get 6 with a remainder of 28.
The number 6 becomes the next digit in our result. 
Result so far: 8984.287356
Subtract 522 from 550 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 13:
When dividing 280 by 87, we get 3 with a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 8984.2873563
Subtracting 261 from 280 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 14:
87 goes into 190 2 times with a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 8984.28735632
Deduct 174 from 190 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 8984.28735632 with a remaining 1.6e-08.