Teaching Resource

Addition Detectives PowerPoint

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43 pages (PowerPoint)|Suitable for Grade: 3

An engaging 43-slide PowerPoint styled as a detective story in which students are tasked with using different addition strategies to uncover suspects.

A bank has been broken into, and a vast sum of money has been stolen. It is up to your students to use their mental addition strategies to reveal the suspects and solve the crime.

This PowerPoint includes seven ‘investigations’, each focusing on a different addition strategy. The investigations include an example of the strategy, a question, an answer and a suspect that is revealed. The story concludes with a final set of questions that reveal the innocent suspects and identify the criminal.

Use this teaching presentation as a consolidation task across multiple lessons to build excitement in the classroom, or solve the crime in one session as a whole-class activity.

This presentation is best paired with the Addition Detectives Unit, which has lessons aligned to each investigation.

Addition strategies include:

  • concrete materials
  • bridging to ten
  • jump strategy
  • number boards
  • split strategy
  • linking addition and subtraction
  • compensation strategy.

To explore addition strategies in greater detail, take a look at the following teaching resources:

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Australian Curriculum alignment

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  • Lilian


    Comment by Lilian on October 20, 2019 at 6:59 pm

    • Tom (Teach Starter) Tom (Teach Starter)

      Hi Lilian,
      I’m glad you like the Addition Detectives PowerPoint. All the best to you and your students solving the mystery!

      Official comment by Tom (Teach Starter) on October 21, 2019 at 9:26 am

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