Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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Addition and Subtraction - Problem 2

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Addition and Subtraction - Problem 1

Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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Some students like to learn math when they can touch something concrete rather than work with a seemingly abstract idea, like negative numbers. These students might like to use colored tiles or chips to represent negative and positive numbers: choose one color to represent positive, and the other for negative. The key idea is that one negative and one positive "cancel each other out," or create a zero. We can use these pairs of positive and negative chips to help us understand adding and subtracting positive and negative numbers.

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