1.2.4: Binary, Hex, Addition & Shifts

How many bits are in a byte?

(a)  

Colours in art packages are often given Hex codes as illustrated above with #00ccff. Why is Hex used in this way rather than the actual 24-bit colour value? Select 3 suitable reasons:

• It is easier for people to remember hex codes than a binary value
• The code only takes up six characters on screen rather than 24
• It is quicker and less prone to error to re-enter a six character hex value than a long binary value.
• It takes up less memory in the computer
• Colours can not be stored in binary values

Convert the binary number 0001 1011 to denary

(a)  

Convert the binary number 1110 0110 to denary

(a)  

Convert the binary number 0010 1001 to denary

(a)  

Which of the following binary numbers represents the denary number 87?

• 0101 1010
• 1100 0100
• 0101 0111
• 0001 1010

A photographer takes up to 2000 photographs per week. Each photograph requires 5MB of storage on the camera’s memory card. Select the camera memory card with the smallest capacity that can store 2000 photographs.

• 4GB
• 8GB
• 16GB
• 32GB

Convert the denary number 57 to binary

(a)  

Convert the denary number 139 to binary

(a)  

Convert the denary number 39 to binary

(a)