Serving advanced learners (and their teachers) since 2012.

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Playlist: Math

Broken Calculator: Multiplication Cross Product

Broken Calculator: Multiplication Cross Product

This calculator multiplies almost correctly. Students will find the one step it skips.

Broken Calculator: 2-Digit Subtraction

Broken Calculator: 2-Digit Subtraction

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