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180 Ways to Use Estimation 180: Inequalities

Estimation 180 is an incredibly rich resource that offers photographs that we can use in meaningfully developing students’ number sense. In this blog post, author Andrew Stadel uses 4 of the images (and the students’ estimates about those images) to quickly and meaningfully introduce (or review) graphing and writing inequalities.

[The suggestions here could be modified to use the pictures for a simpler discussion or writing about more and less.]