We're dividing 750987 by 15 
The aim is to understand the frequency of 15 in 750987.

Advancing to step 1:
If we divide 7 by 15, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 15

On to step 2:
When dividing 75 by 15, we get 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 75 from 75, we get 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 15

Advancing to step 3:
0 divided by 15 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 50.0
Subtract 0 from 0 to get 0.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 15

On to step 4:
15 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 500.0
If we subtract 0 from 9, we get 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 15

Moving on to step 5:
If we divide 98 by 15, we get 6 and a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 5006.0
If we subtract 90 from 98, we get 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 15

Moving on to step 6:
15 can be fit into 87 5 times, resulting in a remainder of 12.
Use 5 as the next digit of our solution. 
Result so far: 50065.0
Subtract 75 from 87 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 7:
15 goes into 120 8 times with a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 50065.8
Deduct 120 from 120 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
0 divided by 15 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 50065.8
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
If we divide 0 by 15, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 50065.8
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 50065.8 with a remainder of 0.0.