Estimating Irrational Numbers on a Number Line

The video tutorial demonstrates how to plot irrational numbers, such as square roots, on a number line without using a calculator. It begins by explaining what irrational numbers are and provides examples like pi. The tutorial then shows how to use square roots to estimate their positions on a number line, using examples like the square roots of 8, 34, and 52. The instructor verifies these estimates with a calculator, emphasizing that even with decimal approximations, the process is straightforward. The lesson concludes by encouraging viewers to visualize number lines mentally for easier problem-solving.

What is an irrational number?

• A number that is always a whole number

• A number that can be written as a fraction

• A number that cannot be written as a fraction

• A number that is always an integer

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CCSS.8.NS.A.1

Which of the following is a famous irrational number?

• Pi (π)

• 2

• 1.5

• 3.14

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CCSS.8.NS.A.1

What is the square root of 16?

• 3

• 5

• 4

• 2

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CCSS.8.EE.A.2

Which number is the square root of 25?

• 7

• 4

• 5

• 6

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CCSS.8.EE.A.2

Where does the square root of 8 fall on the number line?

• Between 3 and 4

• Between 2 and 3

• Between 4 and 5

• Between 1 and 2

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CCSS.8.NS.A.2

The square root of 34 is closest to which two integers?

• 5 and 6

• 7 and 8

• 8 and 9

• 6 and 7

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CCSS.8.NS.A.2

What is the approximate value of the square root of 90?

• 8.5

• 9.0

• 9.5

• 10.0

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CCSS.8.NS.A.2

The square root of 52 is closest to which value?

• 7.8

• 7.2

• 6.5

• 8.1

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CCSS.8.NS.A.2

Why is it useful to think of numbers as their square roots when plotting irrational numbers?

• It makes the problem more complex

• It only works for whole numbers

• It helps in visualizing their positions on the number line

• It is not useful at all

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CCSS.8.NS.A.2

What is a good strategy to estimate the position of an irrational number without a number line?

• Using a calculator

• Guessing randomly

• Ignoring the problem

• Visualizing the number line in your mind

Tags

CCSS.8.NS.A.2