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? 

Here a concise URL for a version of this page without the comments.
Here is the URL which will take them to a related student activity.
Show students how to create fractions in MS Word:
From the 'Insert' menu choose 'Object' then 'Microsoft Equation'
It's even easier with "Math Input Panel" which comes with Windows 7.
In Word 2013 you can find the equation editor in the Insert tab.
What is unique about this fraction sum?