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Estimation of height starter
Nothing fancy here, just a settler, 5 pictures to estimate length, could be followed up by a discussion on how people estimate or what could be considered a sensible estimate.
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True or false circle theory cards
The idea here is that each slide is put onto a card and students have to sort them into two groups true or false. For every false card students must draw an example of it being false (counter example).
This is my first resource going up here, please be nice.