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Integers

Adding moves right, subtracting moves left

Unlocks in Lesson 1: Below zero →

Integers

Subtracting a negative is adding

Unlocks in Lesson 1: Below zero →

Integers

Signs for × and ÷

Unlocks in Lesson 2: Signs for × and ÷ →

Integers

(−4)² is not −4²

Unlocks in Lesson 2: Signs for × and ÷ →