Exploring Multiplying Rational Numbers with Decimals

This video tutorial covers lesson 3.4, focusing on multiplying integers and decimals. It begins with a review of integer multiplication using strategies like the 'triangle of awesomeness' and mnemonic phrases. The lesson then transitions to multiplying positive decimals, explaining the process without aligning decimals. Students practice problems and are encouraged to use notes. The tutorial progresses to more complex problems involving negative decimals, emphasizing the importance of determining the sign first. The video concludes with homework instructions and additional resources for further practice.

What is the result of multiplying two negative integers?

• Zero

• It depends on the integers

• A negative number

• A positive number

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B

Which of the following is true when multiplying a positive integer by a negative integer?

• The result is zero

• The result is always negative

• The result is always positive

• The result is the same as the positive integer

Tags

CCSS.7.NS.A.2A

When multiplying decimals, do you need to line up the decimal points?

• Yes, always

• No, never

• Only for addition and subtraction

• Only if the numbers are negative

Tags

CCSS.5.NBT.B.7

What is the first step in multiplying 3.12 by 4.5?

• Line up the decimal points

• Ignore the decimals and multiply the numbers

• Add the numbers

• Subtract the smaller number from the larger number

Tags

CCSS.5.NBT.B.7

How many decimal places should be in the product of 4.52 and 1.3?

• Two

• One

• Four

• Three

Tags

CCSS.6.NS.B.3

What is the result of multiplying 4.52 by 1.3?

• 5.876

• 6.876

• 8.876

• 7.876

Tags

CCSS.6.NS.B.3

What is the sign of the product of a positive number and a negative number?

• Positive

• Negative

• It depends on the numbers

• Zero

Tags

CCSS.7.NS.A.2A

What is the product of 2 and -3.5?

• 6.0

• -7.0

• 7.0

• -6.0

Tags

CCSS.7.NS.A.2A

What is the product of -4 and -5.71?

• 23.84

• -23.84

• -22.84

• 22.84

Tags

CCSS.7.NS.A.2A

What is the final answer for 15.1 times -2.34?

• -34.334

• 34.334

• 35.334

• -35.334

Tags

CCSS.7.NS.A.2A

CCSS.7.NS.A.2B