Mastering Adding and Subtracting Decimals

Mrs. Trump reviews adding and subtracting decimals using a standard algorithm. The video covers preparation steps, color coding, and features in PowerPoint. It provides examples of adding and subtracting decimals, emphasizing the importance of lining up decimal points and place values. A real-life application problem is solved, demonstrating how to calculate change after a purchase. The video concludes with instructions for completing an assignment.

Why is it important to take notes during the lesson?

• Because the teacher said so

• To have notes for a friend

• To ensure better understanding and retention

• To have something to do

Tags

CCSS.RI.1.1

CCSS.RI.2.1

CCSS.RI.3.1

CCSS.RL.2.1

CCSS.RL.3.1

What is the first step in adding or subtracting decimals?

• Use a calculator

• Add zeros for placeholders

• Line up the decimal points

• Carry down the decimal

Tags

CCSS.6.NS.B.3

What should you do if there's nothing to add or subtract in a place value?

• Skip it

• Assume it's a 9

• Assume it's a 0

• Leave it blank

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CCSS.2.NBT.B.7

What does the term 'sum' indicate in mathematical operations?

• Multiplication

• Division

• Addition

• Subtraction

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CCSS.5.OA.A.1

CCSS.5.OA.A.2

What does the word 'difference' imply in math?

• Addition

• Division

• Subtraction

• Multiplication

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CCSS.5.OA.A.1

CCSS.5.OA.A.2

Why might you align numbers differently when dealing with negative numbers?

• Because it's a rule

• To make the numbers easier to read

• To confuse the calculation

• To potentially end up with a negative result

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CCSS.7.NS.A.1C

What is the purpose of adding zeros when subtracting decimals?

• To change the value of the number

• Both B and C

• To make subtraction easier

• To keep the numbers organized

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CCSS.5.NBT.B.7

In the cafeteria scenario, what operation do you perform first?

• Division

• Addition

• Multiplication

• Subtraction

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CCSS.3.OA.D.8

How do you determine the amount of change received in the cafeteria scenario?

• Add the cost of the meals

• Divide the total by two

• Subtract the total cost from the amount given

• Multiply the costs

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CCSS.7.EE.B.3

What is the final step after calculating the change received?

• Start over

• Log in to your account for more assignments

• Ask for help

• Check your work

Tags

CCSS.6.NS.B.3