Data Representation

Question 1

Common needs

Computer

Answer 1

To store and view data

Question 2

Define

Data

Answer 2

Units of information.In computing there can be different data types including integers, characters and Boolean. Data is often acted on by instructions.

Question 3

What do computers use to “see” everything?

Answer 3

Electrical signals that are on or off, represented by binary numbers

Question 4

Define

Binary

Answer 4

A number system that contains two symbols, 0 and a 1.Aslo known as Base 2.

Question 5

True or False

All data that we want a computer to process must be converted to binary?

Answer 5

True

Question 6

Why is binary known as ‘Base 2’?

Answer 6

• There are only two digits to select from (1 and 0)
• When using the binary system, data is converted using the power of two

Question 7

Define

Denary

Answer 7

The number system most commonly used by people.It contains 10 unique digits 0-9. Aslo known as decimal or base 10.

Question 8

Define

Place value

Answer 8

The value of the place or position of a digit in a number

Question 9

Place value

Binary

Answer 9

1,2,4,8,16,32,64,128 and so on

Question 10

Place value

Denary

Answer 10

1,10,100,1000 and so on

Question 11

How would you work out this decimal value?

1024

Answer 11

(1×1000) + (0×100) + (2×10) + (4×1)=1024

Question 12

How would you work out this binary value?

1010 1000

Answer 12

(1×128) + (0×64) + (1×32) + (0×16) + (0×8) + (0×4) + (0×2) + (0×1) = 168

Question 13

How to convert from binary to denary

Divide method

Answer 13

1. Divide the number by two
2. If it is without remainer then add 0 to next place value else add 1 and floor number
   3.Repeat until number == 0, and write answer formally

Question 14

Addition rules

Binary

Answer 14

• 0+0=0
• 1+0=1
• 1+1=10(for 1+1=2)
• 1+1+1=11(for 3 ones make 3)