Twelve mass word problems, one prize ladder and a class that suddenly cares about converting tonnes to kilograms. Each wrong option is a mistake students really make (like forgetting to convert before adding), so a wrong click gives you something worth talking about. It opens on a removalist's truck docket.

How it runs

• Lesson 1: how to play, a refresher on converting, a worked two-step example and a warm-up round, then the 12-question game. In Present mode students click A to D: a correct answer plays applause and shows Ms Alami's working, a wrong one shows a hint and Try again. Stray clicks on the background do nothing, so the answer can't be skipped to by accident.
• Lesson 2: the case file, a fete fudge stall savings task, and students write their own $1 million question.

Running rotations instead? Print the 12 task cards and the recording sheet with its fold-under answer strip.

Maths covered

• MA3-NSM-01: convert between grams, kilograms and tonnes and solve problems involving different units of mass
• MA3-AR-01 and MA3-MR-01: choose strategies for multistep word problems

Good to know

• Works in PowerPoint, Keynote and Google Slides (the sounds play in PowerPoint and Keynote; the MP3s are included so you can add them in Google Slides).
• Teach it first with Metric Mass Introduction and Reading Scales, or get all three in the Metric Mass Unit Bundle.