We look at the division of 81308478 by 687 
The aim is to understand the frequency of 687 in 81308478.

On to step 1:
687 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 687

Step 2:
When dividing 81 by 687, we get 0 with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Bring next digit (3) of the dividend behind the 81 and repeat the process: 813 / 687

Moving on to step 3:
813 divided by 687 is 1 with a remainder of 126.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 687 away from 813, we end up with 126.
Include the next digit (0) from the dividend after 126, then repeat: 1260 / 687

Let's proceed to step 4:
1260 divided by 687 is 1 with a remainder of 573.
Write down 1 as next digit of the result. 
Result so far: 11.0
If we take 687 away from 1260, we end up with 573.
Bring next digit (8) of the dividend behind the 573 and repeat the process: 5738 / 687

Moving on to step 5:
687 can be fit into 5738 8 times, resulting in a remainder of 242.
The number 8 becomes the next digit in our result. 
Result so far: 118.0
The remainder is 242 after subtracting 5496 from 5738.
Include the next digit (4) from the dividend after 242, then repeat: 2424 / 687

Moving on to step 6:
687 goes into 2424 3 times with a remainder of 363.
Record the quotient 3 as the next digit in the result. 
Result so far: 1183.0
If we subtract 2061 from 2424, we get 363.
Take the next digit (7) from the dividend and append it to 363, then repeat: 3637 / 687

Moving on to step 7:
687 goes into 3637 5 times with a remainder of 202.
The next digit of our result is 5. 
Result so far: 11835.0
Subtracting 3435 from 3637 leaves us with 202.
Fetch the next digit (8) from the dividend, attach it to 202 and continue: 2028 / 687

Moving on to step 8:
If we divide 2028 by 687, we get 2 and a remainder of 654.
Use 2 as the next digit of our solution. 
Result so far: 118352.0
Subtracting 1374 from 2028 leaves us with 654.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6540, and continue the process.

On to step 9:
If we divide 6540 by 687, we get 9 and a remainder of 357.
The next digit of our result is 9. 
Result so far: 118352.9
If we subtract 6183 from 6540, we get 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

On to step 10:
If we divide 3570 by 687, we get 5 and a remainder of 135.
Record the quotient 5 as the next digit in the result. 
Result so far: 118352.95
Subtract 3435 from 3570 to get 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Advancing to step 11:
687 can be fit into 1350 1 times, resulting in a remainder of 663.
The number 1 becomes the next digit in our result. 
Result so far: 118352.951
If we take 687 away from 1350, we end up with 663.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6630, and continue the process.

Going ahead to step 12:
6630 divided by 687 is 9 with a remainder of 447.
Write down 9 as next digit of the result. 
Result so far: 118352.9519
If we take 6183 away from 6630, we end up with 447.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4470, and continue the process.

Step 13:
4470 divided by 687 is 6 with a remainder of 348.
Use 6 as the next digit of our solution. 
Result so far: 118352.95196
If we take 4122 away from 4470, we end up with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Advancing to step 14:
687 can be fit into 3480 5 times, resulting in a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 118352.951965
Subtracting 3435 from 3480 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 15:
If we divide 450 by 687, we get 0 and a remainder of 450.
Record the quotient 0 as the next digit in the result. 
Result so far: 118352.951965
The remainder is 450 after subtracting 0 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Moving on to step 16:
4500 divided by 687 is 6 with a remainder of 378.
Write down 6 as next digit of the result. 
Result so far: 118352.95196506
Subtract 4122 from 4500 to get 378.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

The final result is 118352.95196506 with a remainder of 3.78e-07.