Mastering Multiplication of Rational Numbers

This video tutorial focuses on multiplying rational numbers, specifically positive and negative fractions and mixed numbers. It begins with an introduction to the topic, followed by using a number line to model multiplication and understand properties like the identity and zero product properties. The tutorial then covers the steps to multiply mixed numbers, including converting them to improper fractions and cross-canceling. Finally, it applies rules for multiplying positive and negative numbers, emphasizing the importance of determining the correct sign of the product.

What is the main focus of today's lesson?

• Dividing rational numbers

• Multiplying rational numbers

• Subtracting rational numbers

• Adding rational numbers

Tags

CCSS.7.NS.A.1D

How can we model 3 times negative 3 using repeated addition?

• Negative 3 + Negative 3 + Negative 3

• Negative 3 + 3 + 3

• 3 + Negative 3 + Negative 3

• 3 + 3 + 3

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CCSS.3.OA.D.9

What is the result of 2 times negative 3 using repeated addition?

• Negative 12

• Negative 3

• Negative 6

• Negative 9

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CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

According to the identity property of multiplication, what is 1 times negative 3?

• 3

• Negative 3

• 0

• 1

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CCSS.7.NS.A.2C

What is the result of negative 1 times negative 3?

• Negative 3

• 0

• 3

• Negative 6

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CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

What is the result of a positive times a negative number?

• Positive

• Negative

• Zero

• Undefined

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CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

What is the first step in multiplying mixed numbers?

• Subtract the numbers

• Add the numbers

• Divide the numbers

• Convert to improper fractions

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CCSS.5.NF.B.6

What is 3 times 4 plus 3 in improper fraction form?

• 12/4

• 9/4

• 15/4

• 3/4

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CCSS.7.NS.A.2C

What is the result of 17 divided by 2 in mixed number form?

• 8 and 1/2

• 9 and 1/2

• 7 and 1/2

• 6 and 1/2

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CCSS.5.NF.B.3

What is the result of negative 21 divided by 2?

• Negative 11

• Negative 10

• Negative 10 and 1/2

• Negative 11 and 1/2

Tags

CCSS.7.NS.A.2B