Estimating Square and Cube Roots

The video tutorial explains how to estimate square and cube roots without a calculator. It begins by discussing the concept of square roots and cube roots, then moves on to estimating square roots by identifying nearby perfect squares. The tutorial provides an example with the square root of 180, showing it lies between the square roots of 169 and 196. Similarly, it covers estimating cube roots by identifying nearby perfect cubes, using the example of the cube root of 650, which lies between the cube roots of 512 and 729. The video concludes with a brief mention of more precise approximation methods to be discussed later.

Why is it important to know perfect squares and cubes when estimating roots?

• They help in finding exact values.

• They provide a range within which the root lies.

• They simplify multiplication.

• They are easier to remember.

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What is the first step in estimating the square root of 180?

• Dividing 180 by 2.

• Multiplying 180 by itself.

• Finding perfect squares close to 180.

• Using a calculator.

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CCSS.8.NS.A.2

Which of the following is a perfect square close to 180?

• 150

• 225

• 200

• 169

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CCSS.8.NS.A.2

What is the square root of 169?

• 15

• 14

• 13

• 12

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CCSS.8.EE.A.2

Between which two numbers does the square root of 180 lie?

• 14 and 15

• 15 and 16

• 12 and 13

• 13 and 14

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CCSS.8.NS.A.2

What is the cube root of 512?

• 10

• 9

• 8

• 7

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CCSS.8.EE.A.2

Which of the following is a perfect cube close to 650?

• 343

• 1000

• 512

• 729

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CCSS.8.EE.A.2

What is the cube root of 729?

• 7

• 10

• 8

• 9

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CCSS.8.EE.A.2

Between which two numbers does the cube root of 650 lie?

• 6 and 7

• 7 and 8

• 8 and 9

• 9 and 10

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CCSS.8.EE.A.2

What is the cube of 8?

• 512

• 729

• 216

• 343

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CCSS.8.EE.A.2