An engaging 43-slide PowerPoint themed as a detective story in which students are tasked with using different addition strategies to reveal suspects.
A bank has been broken into, and a vast sum of money has been stolen. Your students must use their mental addition strategies to uncover the suspects and solve the crime.
This PowerPoint includes seven ‘investigations’, each focusing on a different addition strategy to solve single and double-digit problems. 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.
Addition strategies include:
- concrete materials
- making ten
- jump strategy
- number boards
- split strategy
- linking addition and subtraction
- compensation strategy.