Let's divide 87121712 by 816
The aim is to understand the frequency of 816 in 87121712.

Going ahead to step 1:
8 divided by 816 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (7) from the dividend to 8 and continue with: 87 / 816

Advancing to step 2:
When dividing 87 by 816, we get 0 with a remainder of 87.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 87 leaves us with 87.
Take the next digit (1) from the dividend and append it to 87, then repeat: 871 / 816

Let's proceed to step 3:
816 goes into 871 1 times with a remainder of 55.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 816 from 871 and we're left with 55.
Grab the next digit (2) from the dividend, add it to 55, then carry on: 552 / 816

Going ahead to step 4:
816 can be fit into 552 0 times, resulting in a remainder of 552.
The next digit of our result is 0. 
Result so far: 10.0
Deduct 0 from 552 and we're left with 552.
Fetch the next digit (1) from the dividend, attach it to 552 and continue: 5521 / 816

Let's proceed to step 5:
When dividing 5521 by 816, we get 6 with a remainder of 625.
The next digit of our result is 6. 
Result so far: 106.0
Deduct 4896 from 5521 and we're left with 625.
Take the next digit (7) from the dividend and append it to 625, then repeat: 6257 / 816

Going ahead to step 6:
6257 divided by 816 is 7 with a remainder of 545.
The number 7 becomes the next digit in our result. 
Result so far: 1067.0
Subtracting 5712 from 6257 leaves us with 545.
Fetch the next digit (1) from the dividend, attach it to 545 and continue: 5451 / 816

Advancing to step 7:
When dividing 5451 by 816, we get 6 with a remainder of 555.
Write down 6 as next digit of the result. 
Result so far: 10676.0
Subtracting 4896 from 5451 leaves us with 555.
Include the next digit (2) from the dividend after 555, then repeat: 5552 / 816

On to step 8:
816 goes into 5552 6 times with a remainder of 656.
Record the quotient 6 as the next digit in the result. 
Result so far: 106766.0
If we subtract 4896 from 5552, we get 656.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6560, and continue the process.

Let's proceed to step 9:
816 goes into 6560 8 times with a remainder of 32.
Write down 8 as next digit of the result. 
Result so far: 106766.8
The remainder is 32 after subtracting 6528 from 6560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 10:
If we divide 320 by 816, we get 0 and a remainder of 320.
Record the quotient 0 as the next digit in the result. 
Result so far: 106766.8
The remainder is 320 after subtracting 0 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Advancing to step 11:
3200 divided by 816 is 3 with a remainder of 752.
Put 3 as the next digit of the answer. 
Result so far: 106766.803
If we subtract 2448 from 3200, we get 752.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7520, and continue the process.

Going ahead to step 12:
If we divide 7520 by 816, we get 9 and a remainder of 176.
Record the quotient 9 as the next digit in the result. 
Result so far: 106766.8039
If we take 7344 away from 7520, we end up with 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Going ahead to step 13:
816 goes into 1760 2 times with a remainder of 128.
Use 2 as the next digit of our solution. 
Result so far: 106766.80392
If we take 1632 away from 1760, we end up with 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 14:
When dividing 1280 by 816, we get 1 with a remainder of 464.
Use 1 as the next digit of our solution. 
Result so far: 106766.803921
Subtracting 816 from 1280 leaves us with 464.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4640, and continue the process.

On to step 15:
4640 divided by 816 is 5 with a remainder of 560.
The next digit of our result is 5. 
Result so far: 106766.8039215
If we subtract 4080 from 4640, we get 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Moving on to step 16:
When dividing 5600 by 816, we get 6 with a remainder of 704.
The number 6 becomes the next digit in our result. 
Result so far: 106766.80392156
Subtracting 4896 from 5600 leaves us with 704.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7040, and continue the process.

The final result is 106766.80392156 with a remainder of 7.04e-07.