Mathigon
@mathigonorg
The Mathematical Playground – making learning more interactive and engaging than ever before, and FREE for everyone. Part of @amplify
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https://mathigon.org 12-04-2012 06:35:21
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Numbers by Heart, made in collaboration with Dan Finkel, is now live at Fluency Practice! This new set focuses on perceptual subitizing, comparing quantities, and correspondence and cardinality. Learn more at fluency.amplify.com