Three fractions add together to give one fifth.
If all the question marks represent the same number, what is that number?
What if all the question marks represent different numbers?
Topics: Starter  Fractions  Investigations
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See also the Starter called One Ninth and a related GCSE question.
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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=May31 However it would be better to assign one of the student interactive activities below. 

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What is unique about this fraction sum?
One third of my family understand fractions while the other three quarters do not. I wonder which half of the family I am in!