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Broken Calculators
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Broken Calculator: 2-Digit Subtraction
This calculator gets subtraction wrong the same way every time. Can your students crack its broken rule?
Gr 2-3
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.
Gr 2-3
Broken Calculator: Multiplication Cross Product
This calculator multiplies almost correctly. Students will find the one step it skips.
Gr 4-5
Broken Calculator: Simplifying Fractions
This calculator simplifies fractions with a rule that sometimes works. What is it doing wrong?
Gr 3, 4, 6
Broken Calculator: Comparing Decimals
This calculator swears 0.5 is less than 0.45. What’s going on here?
Gr 5
