A good answer might be:

  1. The base is five.
  2. There are five "digits": 0,1, 2, 3, 4 .
  3. Positions correspond to integer powers of five, starting with power 0 at the rightmost digit, and increasing right to left.
  4. The digit placed at a position shows how many times that power of five is included in the number.

Base Five Notation

The number "five" in base five is represented by "10" That is: 

1 × (five)1 + 0 × (five)0

The base in any positional representation is written as "10" (assuming that the usual symbols 0, 1, ... are used). Here is a number represented in base five: 421. It means: 

421 = 4 × five2  +  2 × five1 + 1 × five0

Remember, the symbol "5" can not be used in the base five system. Actually, the above sum should be written as follows. (This looks just like base ten, but remember, here "10" is "five".)

421 = 4 × 102 + 2 × 101 + 1 × 100

QUESTION 8:

Fill in the table.

Base five
Representation		Base ten
Representation
0 
1 
2 
3 
4 
10