In this video, Professor Marília introduces the concept of multiplying integers, emphasizing the change from using 'x' to '.' for multiplication. She stresses the importance of memorizing the multiplication table over using calculators. The video covers the rules of signs in multiplication, providing examples to illustrate positive and negative results. It explains the role of zero as a neutral element and discusses properties like commutative and associative. The lesson concludes with advanced examples, reinforcing the concepts taught.

What symbol is now used for multiplication instead of 'x'?

• A colon

• A semicolon

• A dot

• A comma

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CCSS.2.OA.C.3

What should you use instead of a calculator to learn multiplication tables?

• A calculator

• A multiplication chart

• A dictionary

• A ruler

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CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

What is the result of multiplying two integers with the same sign?

• Negative

• Zero

• Positive

• Undefined

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CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

What is the result of multiplying two integers with different signs?

• Undefined

• Zero

• Negative

• Positive

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CCSS.3.OA.B.5

What is the result of any number multiplied by zero?

• The number itself

• Undefined

• Zero

• One

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CCSS.6.NS.C.6A

Does the number zero have a sign?

• Yes, it is positive

• Yes, it is negative

• Yes, it can be both positive and negative

• No, it is neutral

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CCSS.3.OA.B.5

What is the commutative property of multiplication?

• Multiplying by zero gives zero

• Changing the order of factors does not change the product

• Changing the order of factors changes the product

• Multiplying by one gives the same number

Tags

CCSS.3.OA.B.5

What is the associative property of multiplication?

• Changing the grouping of factors changes the product

• Multiplying by zero gives zero

• Multiplying by one gives the same number

• Changing the grouping of factors does not change the product

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CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

What is the result of multiplying -2, 4, and -6?

• 24

• -24

• 48

• -48

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CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

What is the result of multiplying 1, -5, and 5?

• -5

• 5

• 25

• -25

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CCSS.7.NS.A.2A

CCSS.7.NS.A.2B