How many numbers below are factors of other numbers in the table?
41  17  8  26 
33  10  5  37 
6  32  32  46 
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.