We look at the division of 78978709 by 216 
The aim is to understand the frequency of 216 in 78978709.

On to step 1:
The number 216 fits into 7 0 times, leaving 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 / 216

Let's proceed to step 2:
216 goes into 78 0 times with a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Bring next digit (9) of the dividend behind the 78 and repeat the process: 789 / 216

Step 3:
When dividing 789 by 216, we get 3 with a remainder of 141.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 648 from 789 and we're left with 141.
Take the next digit (7) from the dividend and append it to 141, then repeat: 1417 / 216

Moving on to step 4:
When dividing 1417 by 216, we get 6 with a remainder of 121.
Record the quotient 6 as the next digit in the result. 
Result so far: 36.0
If we subtract 1296 from 1417, we get 121.
Bring next digit (8) of the dividend behind the 121 and repeat the process: 1218 / 216

Moving on to step 5:
1218 divided by 216 is 5 with a remainder of 138.
Record the quotient 5 as the next digit in the result. 
Result so far: 365.0
If we subtract 1080 from 1218, we get 138.
Append the next digit (7) from the dividend to 138 and continue with: 1387 / 216

On to step 6:
If we divide 1387 by 216, we get 6 and a remainder of 91.
Write down 6 as next digit of the result. 
Result so far: 3656.0
If we take 1296 away from 1387, we end up with 91.
Take the next digit (0) from the dividend and append it to 91, then repeat: 910 / 216

Step 7:
If we divide 910 by 216, we get 4 and a remainder of 46.
The next digit of our result is 4. 
Result so far: 36564.0
Subtracting 864 from 910 leaves us with 46.
Append the next digit (9) from the dividend to 46 and continue with: 469 / 216

Advancing to step 8:
When dividing 469 by 216, we get 2 with a remainder of 37.
The next digit of our result is 2. 
Result so far: 365642.0
Subtract 432 from 469 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Moving on to step 9:
When dividing 370 by 216, we get 1 with a remainder of 154.
Put 1 as the next digit of the answer. 
Result so far: 365642.1
If we subtract 216 from 370, we get 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Advancing to step 10:
If we divide 1540 by 216, we get 7 and a remainder of 28.
Record the quotient 7 as the next digit in the result. 
Result so far: 365642.17
If we subtract 1512 from 1540, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 11:
216 can be fit into 280 1 times, resulting in a remainder of 64.
Put 1 as the next digit of the answer. 
Result so far: 365642.171
Subtracting 216 from 280 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 12:
When dividing 640 by 216, we get 2 with a remainder of 208.
The number 2 becomes the next digit in our result. 
Result so far: 365642.1712
Deduct 432 from 640 and we're left with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Moving on to step 13:
If we divide 2080 by 216, we get 9 and a remainder of 136.
The number 9 becomes the next digit in our result. 
Result so far: 365642.17129
Subtracting 1944 from 2080 leaves us with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

On to step 14:
The number 216 fits into 1360 6 times, leaving a remainder of 64.
Record the quotient 6 as the next digit in the result. 
Result so far: 365642.171296
If we subtract 1296 from 1360, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 15:
640 divided by 216 is 2 with a remainder of 208.
Record the quotient 2 as the next digit in the result. 
Result so far: 365642.1712962
If we subtract 432 from 640, we get 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

On to step 16:
If we divide 2080 by 216, we get 9 and a remainder of 136.
Write down 9 as next digit of the result. 
Result so far: 365642.17129629
If we take 1944 away from 2080, we end up with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

The final outcome is 365642.17129629, with a leftover of 1.36e-07.