Multiplying Decimals and Determining Signs

The video tutorial explains how to multiply two negative decimal numbers, -8.5 and -2.4. It begins by determining the sign of the product, which is positive since a negative times a negative is positive. The tutorial then explains how to handle decimal places in multiplication, showing that the product should have two decimal places. The multiplication is performed as if the numbers are whole, and the decimal point is adjusted accordingly. Finally, the result is simplified from 20.40 to 20.4, emphasizing the importance of simplifying decimals.

What is the sign of the product when multiplying two negative numbers?

• Zero

• Negative

• Undefined

• Positive

Tags

CCSS.7.NS.A.2A

What is the importance of determining the sign of the product first?

• It helps in simplifying the calculation

• It determines the final result

• It is not important

• It is a mathematical rule

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CCSS.6.NS.B.3

How many decimal places should the product of 8.5 and 2.4 have?

• One

• Two

• Three

• Four

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CCSS.4.NBT.B.5

What is the first step in multiplying 85 by 24?

• Add the numbers

• Multiply by 4

• Multiply by 2

• Subtract the numbers

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CCSS.4.NBT.B.5

What is the result of multiplying 85 by 24?

• 2040

• 2400

• 2080

• 2004

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CCSS.6.NS.B.3

Where should the decimal point be placed in the product of 8.5 and 2.4?

• Two places to the left

• To the left of the last digit

• Two places to the right

• To the right of the last digit

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CCSS.5.NBT.B.7

What is the simplified form of 20.40?

• 204.0

• 2.04

• 20.04

• 20.4

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CCSS.5.NBT.A.3A

Why can the zero in 20.40 be dropped?

• It is a placeholder

• It is unnecessary

• It simplifies the decimal

• It is incorrect

Tags

CCSS.7.NS.A.2A

What is the final product of negative 8.5 times negative 2.4?

• Negative 20.4

• Positive 20.4

• Negative 20.40

• Positive 20.40

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CCSS.5.NBT.A.2

What is the result of dividing forty hundredths by 10?

• Four thousandths

• Four hundredths

• Four units

• Four tenths

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CCSS.5.NBT.A.2