We look at the division of 79970905 by 999 
The aim is to understand the frequency of 999 in 79970905.

Going ahead to step 1:
7 divided by 999 is 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 999

Step 2:
999 goes into 79 0 times with a remainder of 79.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 79, we end up with 79.
Grab the next digit (9) from the dividend, add it to 79, then carry on: 799 / 999

On to step 3:
When dividing 799 by 999, we get 0 with a remainder of 799.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 799 leaves us with 799.
Include the next digit (7) from the dividend after 799, then repeat: 7997 / 999

Advancing to step 4:
999 can be fit into 7997 8 times, resulting in a remainder of 5.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we subtract 7992 from 7997, we get 5.
Grab the next digit (0) from the dividend, add it to 5, then carry on: 50 / 999

On to step 5:
The number 999 fits into 50 0 times, leaving a remainder of 50.
Use 0 as the next digit of our solution. 
Result so far: 80.0
The remainder is 50 after subtracting 0 from 50.
Bring next digit (9) of the dividend behind the 50 and repeat the process: 509 / 999

On to step 6:
When dividing 509 by 999, we get 0 with a remainder of 509.
Use 0 as the next digit of our solution. 
Result so far: 800.0
Deduct 0 from 509 and we're left with 509.
Bring next digit (0) of the dividend behind the 509 and repeat the process: 5090 / 999

Moving on to step 7:
The number 999 fits into 5090 5 times, leaving a remainder of 95.
Use 5 as the next digit of our solution. 
Result so far: 8005.0
Subtract 4995 from 5090 to get 95.
Include the next digit (5) from the dividend after 95, then repeat: 955 / 999

On to step 8:
999 can be fit into 955 0 times, resulting in a remainder of 955.
Use 0 as the next digit of our solution. 
Result so far: 80050.0
If we take 0 away from 955, we end up with 955.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9550, and continue the process.

On to step 9:
When dividing 9550 by 999, we get 9 with a remainder of 559.
Use 9 as the next digit of our solution. 
Result so far: 80050.9
Subtracting 8991 from 9550 leaves us with 559.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5590, and continue the process.

On to step 10:
999 can be fit into 5590 5 times, resulting in a remainder of 595.
Record the quotient 5 as the next digit in the result. 
Result so far: 80050.95
If we subtract 4995 from 5590, we get 595.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5950, and continue the process.

Step 11:
5950 divided by 999 is 5 with a remainder of 955.
The number 5 becomes the next digit in our result. 
Result so far: 80050.955
Deduct 4995 from 5950 and we're left with 955.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9550, and continue the process.

The final outcome is 80050.955, with a leftover of 0.0955.