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Pre-Algebra 3-9 Finding Square Roots Warm Up Find the two square roots of each number. Evaluate each expression. Pre-Algebra 3-9 Finding Square Roots 1216.

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Presentation on theme: "Pre-Algebra 3-9 Finding Square Roots Warm Up Find the two square roots of each number. Evaluate each expression. Pre-Algebra 3-9 Finding Square Roots 1216."— Presentation transcript:

1 Pre-Algebra 3-9 Finding Square Roots Warm Up Find the two square roots of each number. Evaluate each expression. Pre-Algebra 3-9 Finding Square Roots 12 Hmwk & calculator outt

2 Pre-Algebra 3-9 Finding Square Roots Learn to estimate square roots to a given number of decimal places and solve problems using square roots. Finding Square Roots

3 Pre-Algebra 3-9 Finding Square Roots Each square root is between two integers. Name the integers. 55 Think: What are perfect squares close to 55? 7 2 = = is between 7 and 8. A.

4 Pre-Algebra 3-9 Finding Square Roots 90 – Think: What are perfect squares close to 90? –9 2 = 81 –10 2 = 100 Each square root is between two integers. Name the integers. 90 – is between –9 and –10. B.

5 Pre-Algebra 3-9 Finding Square Roots Each square root is between two integers. Name the integers. 80 Think: What are perfect squares close to 80? 8 2 = = 81 is between 8 and A.

6 Pre-Algebra 3-9 Finding Square Roots 45 – Each square root is between two integers. Name the integers. Think: What are perfect squares close to 45? –6 2 = 36 –7 2 = – is between –6 and –7. B.

7 Pre-Algebra 3-9 Finding Square Roots Additional Examples 3: Using a Calculator to Estimate the Value of a Square Root Using a calculator, 500 ≈ …. Rounded, 500 is Use a calculator to find 500. Round to the nearest tenth.

8 Pre-Algebra 3-9 Finding Square Roots Try This: Example 3 Rounded, 200 is Using a calculator, 200 ≈ …. Use a calculator to find 200. Round to the nearest tenth.

9 Pre-Algebra 3-9 Finding Square Roots First find the length of a side. Then you can use the length of a side to find the perimeter, the length of fringe around the tablecloth. You want to sew a fringe on a square tablecloth with an area of 500 square inches. Calculate the length of each side of the tablecloth and the length of fringe you will need to the nearest tenth of an inch. Understand the Problem

10 Pre-Algebra 3-9 Finding Square Roots The length 63.2 feet divided by 4 is 15.8 feet. A 15.8 foot square has an area of square feet, which is close to 250, so the answers are reasonable. Look Back Try This: Example 2 Continued

11 Pre-Algebra 3-9 Finding Square Roots Lesson Quiz Each square root is between two integers. Name the two integers – 456 Use a calculator to find each value. Round to the nearest tenth A square field has an area of 2000 square feet. To the nearest foot, how much fencing would be needed to enclose the field? 5 and 6–22 and – ft


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