How Do You Do?

123
312
999

Highlight three numbers from those above that add up to 17.

A Mathematics Lesson Starter Of The Day


Topics: Starter | Arithmetic | Place Value | Problem Solving | Puzzles

  • Transum,
  •  
  • Once pupils have understood the rules of combining digits in this puzzle the next step is to develop some strategies. Click on the button lower down this page to generate another version of this puzzle from random numbers. Even armed with a calculator and paper many pupils will opt for a mental method to home in on the correct answer.
  • Mrs Limestone,
  •  
  • Can you also subtract?

    [Transum: No, addition only. The answer can be seen by teachers lower down this page.]
  • 4G, Epping West
  •  
  • My class says this is impossible to solve! Thank you.
  • Amy Brookman, Cambridge
  •  
  • This isn't possible?

    [Transum: You'll be surprised Amy. The answer can be seen by teachers lower down this page.]
  • Roger, Stoke College
  •  
  • Clue - not all numbers are single digit.

How did you use this starter? Can you suggest how teachers could present or develop this resource? Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for Maths teachers anywhere in the world.
Click here to enter your comments.

Previous Day | This starter is for 9 August | Next Day

 

Answers

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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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Laptops In Lessons

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=August9

However it would be better to assign one of the student interactive activities below.

Laptops In Lessons

Here is the URL which will take them to an interactive activity involving products.

Transum.org/go/?to=Product

Student Activity

 


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