How many numbers below are factors of other numbers in the table?
45  25  18  32 
43  33  45  31 
42  11  15  21 
How many numbers above are multiples of other numbers in the table?
Topics: Starter  Factors  Number
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Previous Day  This starter is for 30 July  Next Day
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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=July30 However it would be better to assign one of the student interactive activities below. 

While factors are in mind follow this URL to a student version of the Sieve of Eratosthenes.
See the National Curriculum page for links to related online activities and resources.