Math, 4th grade: Fermi tasks

What are "Fermi" tasks?
Fermi problems are named after the Italian nuclear physicist and Nobel Prize winner Enrico Fermi (1901–1954). Fermi was known for encouraging his students' thinking skills through unusual questions.
What does the collection of exercises on the topic "Fermi Problems - Research, Calculate, Justify" for 4th grade math contain?
This collection of exercises contains 20 different Fermi problems, and you'll also be given an explanation of how to approach these types of problems beforehand. Of course, you'll also receive the solutions to all of them—but don't be surprised, the exercises don't have clear-cut results; the approaches found, and thus the solutions themselves, must be sufficiently explained and justified.
Have fun researching, calculating and reasoning!
What does the downloadable Fermi Tasks collection contain?

• 22 DIN A4 pages as PDF for downloading and printing
• Solutions to the tasks for download as PDF
• 2nd edition

What does the printed material collection "Fermi Tasks" contain?

• Task folder with 22 DIN A4 pages
• Delivery is by post
• Solutions enclosed
• 2nd edition

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