Arithmetic with a mirror © Siemens Stiftung 2015 CC BY-SA 4.0 international

Arithmetic with a mirror

Interactive

Interactive arithmetic exercise:
Five coins are arranged on a table. How must the pocket mirror be placed to double the number of coins? (And four other exercises.)

English, Spanish, German
Interactive
SWF (213.6 kByte), HTML (1.8 MByte)
2019-05-04
Three possible positions for the pocket mirror are given in each case. Click the button with a check mark to show the correct mirror position. At the same time, a photo showing the correct answer is displayed.
Assignment; Worksheet (interactive)
Mathematics
Grade 1 to 4
Elementary school
Axial symmetry; Basic arithmetic operation; Geometric figure; Geometry; Optics
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© Siemens Stiftung 2015
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