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University of Cambridge

University of Cambridge: Nrich: Building Stars

For Students 3rd - 8th
This interactive activity gives you an opportunity to color in a tessellation that is different from the usual. Read the short introduction to find out more about this tessellation that doesn't repeat.
Unit Plan
Khan Academy

Khan Academy: Count Objects 2

For Students Pre-K - 1st Standards
Practice counting up to 20 objects in random patterns. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.