Binary, binary addition and HEX

What are the only two numbers you can use in binary?

• 0 and 1
• 1 and 2
• 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
• 1, 2, 4, 8, 16

If 1 and 0 mean on and off. Is the number 1 on or off?

• ON
• OFF

Convert 65 to binary

• 01100001
• 00100001
• 01000001
• 00100101

Convert 128 to binary

• 10000000
• 01111110
• 10000001
• 11001100

Convert 254 to binary

• 11110000
• 11111100
• 11111111
• 11111110

Convert 37 to binary

• 00100101
• 00100011
• 00100111
• 01000101

Convert the Hex number DA to binary.

• 11001010
• 11011011
• 11011010
• 11011110

Convert the Hex number B9 to binary.

• 10111001
• 10111000
• 10111101
• 10101001

Convert the binary number 10101010 to Hex

• AA
• BB
• CC
• DD

Convert the binary number 11000011 to Hex

• 11

• A2

• C3

• D4