Unit 5: Addition and Subtraction up to 20

What are adddends ?

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What does it mean to compose numbers?

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Which ones are counting (natural) numbers?

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How do you decompose numbers?

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What does finding the difference mean? Find the number sentence that shows the difference.

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What does the equal sign tell you about the equations?

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Which one shows examples of equations?

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Which one is an example of mathematical expressions?

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What are fact families?

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Which one shows the minuend?

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