Let's divide 780942 by 15
The aim is to understand the frequency of 15 in 780942.

Step 1:
If we divide 7 by 15, we get 0 and 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.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 15

Going ahead to step 2:
15 can be fit into 78 5 times, resulting in a remainder of 3.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we subtract 75 from 78, we get 3.
Grab the next digit (0) from the dividend, add it to 3, then carry on: 30 / 15

Let's proceed to step 3:
When dividing 30 by 15, we get 2 with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 52.0
The remainder is 0 after subtracting 30 from 30.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 15

On to step 4:
15 can be fit into 9 0 times, resulting in a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 520.0
If we take 0 away from 9, we end up with 9.
Bring next digit (4) of the dividend behind the 9 and repeat the process: 94 / 15

Step 5:
The number 15 fits into 94 6 times, leaving a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 5206.0
If we take 90 away from 94, we end up with 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 15

Going ahead to step 6:
15 goes into 42 2 times with a remainder of 12.
Write down 2 as next digit of the result. 
Result so far: 52062.0
Deduct 30 from 42 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 7:
When dividing 120 by 15, we get 8 with a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 52062.8
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.

Moving on to step 8:
When dividing 0 by 15, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 52062.8
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
15 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 52062.8
The remainder is 0 after subtracting 0 from 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 52062.8 with a remainder of 0.0.