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Broken Calculator: 2-Digit Addition

This calculator adds two-digit numbers wrong, the same way every time. Crack the rule, then predict its next mistake.

Broken Calculator: 2-Digit Subtraction

This calculator gets subtraction wrong the same way every time. Can your students crack its broken rule?

A Donut Investigation

In this cross-curricular investigation, students will look into an intriguing question: do donuts or salads have more sugar? They’ll grapple with misleading information, bias, and use their math skills to create a visual representation of sugar in popular foods.