CompSci Review So Far

Convert 128 to binary

• 10000000
• 01111110
• 10000001
• 11001100

Convert 11111111 to decimal

• 255
• 245
• 235
• 225

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

Tags

CCSS.4.NBT.A.2

Which of these are the correct place values for binary?

• 128,64,32,16,8,4,2,1

• 128, 68,34,12,6,4,2,1

• 1,0

• 0,1

If a binary number ends with a 1, it must be...

• An odd number
• An even number
• A prime number
• The number 12

Tags

CCSS.2.OA.C.3

What is the denary number system?

• It counts the number of dens
• Our usual base 10 number system
• A special number system for computers
• Den Ary's number system

What is the point of binary?

• It represents how computers interpret electrical signals
• Because we like to make you do extra maths ;-D
• For the lulz
• Because it describes star systems

How would you write the number two in binary?

• 1001
• 0001
• 0000
• 0010

Tags

CCSS.2.NBT.A.3

Computers can only understand 0s and 1s.

• True
• False

Binary is made up of which numbers 

• 3 and 4.
• 2 and 3.
• 1 and 2.
• 0 and 1.