Add up all of the numbers from
1 to 40
Topics: Starter  Algebra  Number  Problem Solving  Sequences
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Note to teacher: Doing this activity once with a class helps students develop strategies. It is only when they do this activity a second time that they will have the opportunity to practise those strategies. That is when the learning is consolidated. Click the button above to regenerate another version of this starter from random numbers.
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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=February26 However it would be better to assign one of the student interactive activities below. 

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The famous Mathematician Carl Gauss found a quick way to perform this type of calculation when he was a boy; a long time before calculators! Can you find more details of this story?
See the National Curriculum page for links to related online activities and resources.