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Find the two square roots of each number. Evaluate each expression. 12 16 20 119 1. 144 2. 256 3. 8+ 144 4. 7 289 Before the Bell 3-6

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Today’s learning Target: 3-6 estimate square roots. I can approximate square roots.

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Now….Make a list of 10 perfect squares. To Estimate Vocabulary – To roughly calculate 3-6 To Approximate – To come very close to the exact answer 1, 4, 9, 16, 25, 36, 49, 64, 81, 100…

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Estimate the square root of 55, then approximate. Think: What are perfect squares close to 55? 55is between 7 and 8 because 55 is between 49 and 64. I’ll show you. 3-6 Estimate Approximate: 55 Using your calculator: 7.4

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Estimate the square root of -90, then approximate. I’ll show you. 3-6 Estimate Approximate: 90 Using your calculator: -9.5 – 90 is between –10 and –9 because 90 is between 81 and 100.

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Estimate the square root of 80, then approximate. 80 Think: What are perfect squares close to 80? 80is between 8 and 9 because 80 is between 64 and 81. Try this with a partner. 3-6 Estimate Approximate: 8.9

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Rounded, 800 is 28.3. Using a calculator, 800 ≈ 28.2842712 …. Use a calculator to find 800. Round to the nearest tenth. 3-6 Think on your own. Is this an approximation or estimation?

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Did you master today’s learning target? Prove it with a three question quiz. 3-6

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1. Name the two integers the square root is between. A. 5 and 6 B. 6 and 7 C. 8 and 9 D. 38 and 40 3-6

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2. Use a calculator to round to the nearest tenth. A. 2.3 B. 4.5 C. 6.7 D. 9.2 3-6

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3. Name the two integers the square root is between. A. –2 and –3 B. –10 and –11 C. –14 and –15 D. –15 and –16 Lesson Quiz for Student Response Systems 3-6

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Assignment: Lesson 3-6 Page 118, 17-38, 40, 42-43 Quiz on Friday, lessons 3.5 – 3.6 3-6

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