78884212 ÷ 15 
The aim is to understand the frequency of 15 in 78884212.

Let's proceed 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 subtract 0 from 7, we get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 15

On to step 2:
The number 15 fits into 78 5 times, leaving a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Deduct 75 from 78 and we're left with 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 15

On to step 3:
If we divide 38 by 15, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 52.0
If we take 30 away from 38, we end up with 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 15

Going ahead to step 4:
When dividing 88 by 15, we get 5 with a remainder of 13.
Use 5 as the next digit of our solution. 
Result so far: 525.0
If we take 75 away from 88, we end up with 13.
Take the next digit (4) from the dividend and append it to 13, then repeat: 134 / 15

Moving on to step 5:
15 can be fit into 134 8 times, resulting in a remainder of 14.
Record the quotient 8 as the next digit in the result. 
Result so far: 5258.0
Subtract 120 from 134 to get 14.
Include the next digit (2) from the dividend after 14, then repeat: 142 / 15

On to step 6:
142 divided by 15 is 9 with a remainder of 7.
Put 9 as the next digit of the answer. 
Result so far: 52589.0
The remainder is 7 after subtracting 135 from 142.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 15

Going ahead to step 7:
If we divide 71 by 15, we get 4 and a remainder of 11.
Put 4 as the next digit of the answer. 
Result so far: 525894.0
If we take 60 away from 71, we end up with 11.
Fetch the next digit (2) from the dividend, attach it to 11 and continue: 112 / 15

Let's proceed to step 8:
The number 15 fits into 112 7 times, leaving a remainder of 7.
Put 7 as the next digit of the answer. 
Result so far: 5258947.0
The remainder is 7 after subtracting 105 from 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 9:
The number 15 fits into 70 4 times, leaving a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 5258947.4
Subtracting 60 from 70 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
100 divided by 15 is 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 5258947.46
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 11:
The number 15 fits into 100 6 times, leaving a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 5258947.466
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

In conclusion, the division gives 5258947.466 with a balance of 0.001.