Understanding Number Line Models for Addition and Subtraction

The video tutorial explores adding and subtracting positive and negative numbers using number line models. It covers various examples, including negative two plus negative seven, six plus negative two, negative 2/5 plus 4/5, and five 1/2 plus negative three. The tutorial uses both horizontal and vertical number lines to visualize these operations, helping learners understand the concepts through practical examples.

What is the purpose of using number line models in mathematics?

• To confuse students with diagrams

• To replace traditional arithmetic methods

• To visualize and understand addition and subtraction of numbers

• To make calculations more complex

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CCSS.7.NS.A.1B

Which number line model correctly represents the expression negative two plus negative seven?

• Starting at positive two and subtracting seven

• Starting at negative five and subtracting four

• Starting at negative two and adding negative seven

• Starting at zero and adding seven

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CCSS.7.NS.A.1B

In a vertical number line, what does adding a negative number do?

• Moves you to the right

• Keeps you at the same position

• Moves you down the line

• Moves you up the line

Tags

CCSS.7.NS.A.1B

How does the number line model represent the expression six plus negative two?

• Starting at zero and moving up six

• Starting at six and moving down two

• Starting at four and moving up two

• Starting at six and moving up two

Tags

CCSS.7.NS.A.1B

What is the result of the expression negative 2/5 plus 4/5 on a number line?

• Positive 2/5

• Negative 6/5

• Zero

• Negative 2/5

Tags

CCSS.7.NS.A.1B

When starting at negative 2/5, how many steps to the right are needed to add 4/5?

• 5 steps

• 4 steps

• 3 steps

• 2 steps

Tags

CCSS.7.NS.A.1B

What is the final position on the number line for the expression five 1/2 plus negative three?

• Zero

• Negative two 1/2

• Five 1/2

• Two 1/2

Tags

CCSS.7.NS.A.1B

How does the number line model represent five 1/2 plus negative three?

• Three to the left and five 1/2 to the right

• Three to the right and five 1/2 to the left

• Five 1/2 to the right and three to the left

• Five 1/2 to the left and three to the right

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What is the significance of the tip of the arrow in a number line model?

• It indicates the starting point

• It shows the direction of movement

• It marks the final position

• It is irrelevant to the calculation

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CCSS.RI.1.1

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Why is it important to find excitement in learning activities?

• It distracts from the main task

• It helps in memorizing facts

• It makes the process more enjoyable and effective

• It is not important at all

Tags

CCSS.RI.2.1

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CCSS.RL.1.1

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