Academy · French-speaking Switzerland · 7P · Mathematics
Le Bolide trop léger
The Flèche racer weighed 3.50 kg yesterday and 3.25 kg this morning. Yet no part has been removed. Compare the weighings and explain the difference before the start.
The story
A mystery to solve
Inès and Basile have built a wooden racer for a friendly competition. Each vehicle must have the same mass. Yesterday, their racer was ready; today the display shows a smaller number. Before adding a metal plate, investigate the readings and the actions that could explain the difference.
See 9 sample pagesInside the pack
What children practise
- Read and compare decimal numbers.
- Calculate masses and convert units.
- Distinguish an object’s mass from its support’s mass.
- Check an explanation against several trials.
Learning scope
Curriculum and level
Selected Swiss PER cycle 2 mathematics practice for 7P, within the shared 7P–8P progression: decimal numbers, operations and mass (MSN 22, MSN 23 and MSN 24, with MSN 25). Not the full annual curriculum.
Source guidelines
Formats and delivery
What does the digital PDF include?
37 pages in A4 + US Letter, with six missions and adult answers. Download the files through Gumroad and print them at home. This purchase does not include a physical book or shipping.
Three teacher documents included with the PDF
Alongside the illustrated book, this Academy PDF pack includes three separate classroom documents, all in French:
- The story and reading texts, without the activity questions.
- Illustrated questions and activities, with space for pupils to respond.
- A teacher guide with hints, worked answers and PER curriculum references.
The two pupil documents use Century Gothic 12 with generous spacing. These documents accompany the digital PDF purchase; they are not included with the printed book.
How is the printed book different?
The printed edition is a separate A5 colour paperback with 54 pages, ordered through Lulu. Its pagination differs from the PDF. Shipping charges and delivery estimates are confirmed by Lulu at checkout.
MystMind
Ready to begin?
Try the first mission for free, then get the complete printable adventure.
