We look at the division of 15090349 by 687 
The aim is to understand the frequency of 687 in 15090349.

On to step 1:
1 divided by 687 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 687

Moving on to step 2:
The number 687 fits into 15 0 times, leaving a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Grab the next digit (0) from the dividend, add it to 15, then carry on: 150 / 687

Moving on to step 3:
When dividing 150 by 687, we get 0 with a remainder of 150.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 150, we get 150.
Fetch the next digit (9) from the dividend, attach it to 150 and continue: 1509 / 687

Step 4:
1509 divided by 687 is 2 with a remainder of 135.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 135 after subtracting 1374 from 1509.
Fetch the next digit (0) from the dividend, attach it to 135 and continue: 1350 / 687

On to step 5:
1350 divided by 687 is 1 with a remainder of 663.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we take 687 away from 1350, we end up with 663.
Grab the next digit (3) from the dividend, add it to 663, then carry on: 6633 / 687

On to step 6:
If we divide 6633 by 687, we get 9 and a remainder of 450.
The number 9 becomes the next digit in our result. 
Result so far: 219.0
The remainder is 450 after subtracting 6183 from 6633.
Append the next digit (4) from the dividend to 450 and continue with: 4504 / 687

Let's proceed to step 7:
4504 divided by 687 is 6 with a remainder of 382.
The number 6 becomes the next digit in our result. 
Result so far: 2196.0
Deduct 4122 from 4504 and we're left with 382.
Take the next digit (9) from the dividend and append it to 382, then repeat: 3829 / 687

Moving on to step 8:
The number 687 fits into 3829 5 times, leaving a remainder of 394.
The next digit of our result is 5. 
Result so far: 21965.0
If we subtract 3435 from 3829, we get 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

On to step 9:
687 can be fit into 3940 5 times, resulting in a remainder of 505.
Use 5 as the next digit of our solution. 
Result so far: 21965.5
Deduct 3435 from 3940 and we're left with 505.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

Advancing to step 10:
5050 divided by 687 is 7 with a remainder of 241.
Use 7 as the next digit of our solution. 
Result so far: 21965.57
If we subtract 4809 from 5050, we get 241.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

Moving on to step 11:
687 goes into 2410 3 times with a remainder of 349.
Write down 3 as next digit of the result. 
Result so far: 21965.573
Subtract 2061 from 2410 to get 349.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3490, and continue the process.

Advancing to step 12:
687 can be fit into 3490 5 times, resulting in a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 21965.5735
If we subtract 3435 from 3490, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 13:
When dividing 550 by 687, we get 0 with a remainder of 550.
Put 0 as the next digit of the answer. 
Result so far: 21965.5735
If we subtract 0 from 550, we get 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5500, and continue the process.

Advancing to step 14:
687 can be fit into 5500 8 times, resulting in a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 21965.573508
Subtracting 5496 from 5500 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 15:
40 divided by 687 is 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 21965.573508
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 16:
The number 687 fits into 400 0 times, leaving a remainder of 400.
Record the quotient 0 as the next digit in the result. 
Result so far: 21965.573508
Subtract 0 from 400 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Our division results in 21965.573508 with a remaining 4e-07.