It is a square number
It is an odd number
It is < 50 and > 20
7 is a factor
It is > 50 and < 90
It is an even number
It is a multiple of 8
24 is a factor
It is a prime number
It is < 40, with two digits
If you double it and take away 9 you get a square number
It is an even number
It is < 79
5, 4, and 3 are all factors
It is a multiple of 10
It is a square number
It is an odd number
It is < 50 and > 20
4 is a factor
Topics: Starter  Number  Riddles
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Teacher, do your students have access to computers such as tablets, iPads or Laptops? This page was really designed for projection on a whiteboard but if you really want the students to have access to it here is a concise URL for a version of this page without the comments: Transum.org/go/?Start=August19 However it would be better to assign one of the student interactive activities below. 

Here is the URL which will take them to a fastreaction game based on the properties of numbers.
Here is the URL which will take you to the Transum collection of Maths Riddles.
Transum.org/Maths/Puzzles/Riddles/