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:

teaching resource Bridging to Ten PowerPoint A 14-slide PowerPoint that uses engaging animations to step students through the 'bridging to ten' addition strategy. teaching resource Addition on a Number Line - Jump Strategy Slide Deck Model adding two-digit numbers with regrouping using a number line and the jump strategy with a handy instructional slide deck. teaching resource Split Strategy Teaching PowerPoint Learn all about the split strategy with this teaching PowerPoint. teaching resource Compensation Strategy Teaching PowerPoint Teach your students to use the compensation strategy for addition with an interactive teaching slide deck.

Take a look at the following segment from our Gamified Learning Using Interactive PowerPoints webinar. Resource Producer Tom will step through how to use this PowerPoint with your class.