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How Many Ways: Add to 5

Fill in the blanks so two decimals add to exactly 5, using each digit only once.

Broken Calculator: Multiplication Cross Product

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

Evens and Odds – Addition and Subtraction

When we’re adding and subtracting, do evens make odds into evens? Do odds make evens odd? Which one has… more power!?

Bulls and Cows

How quickly can you break the numeric code?