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Transparency 2 Click the mouse button or press the Space Bar to display the answers.
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Example 2-2b Objective Estimate square roots
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Example 2-2b Math Symbols Approximately
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Lesson 2 Contents Example 1Estimate Square Roots Example 2Estimate Square Roots
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Example 2-1a Write the problem Estimate to the nearest whole number. 1/2 Think of the perfect square less than 54 7 7 = 49 49 Add the < sign < 64 Bring down Think of the perfect square greater than 54 8 8 = 64 Add the < sign <
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Example 2-1a Determine which number 54 is closer to Estimate to the nearest whole number. 1/2 49 < 54 < 64 54 - 49 = 5 64 - 54 = 10 54 is closer to 49 So 54 is estimated to 7 7 Answer:
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Example 2-1b Answer: 8 Estimate to the nearest whole number. 1/2
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Example 2-2a FINANCE If you were to invest $100 in a bank account for two years, your money would earn interest daily and be worth more when you withdrew it. If you had $120 after two years, the interest rate, written as a decimal, would be found using the expression Find the value. 2/2 Write the problem
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Example 2-2a Answer: The interest rate = 10% 2/2 Follow order of operations PEMDAD Inside the parenthesis find the square root 10.96 Bring down rest of expression 10.96 - 10 10 Subtract in numerator.96 10 Divide numerator by denominator 0.096 Round to hundredths (2 places to the right of the decimal) Remember: interest rate is percent so multiply decimal by 100 for percent 0.10 10%
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Example 2-2b Answer: Interest rate = 20% FINANCE If you were to invest $100 in a bank account for two years, your money would earn interest daily and be worth more when you withdrew it. If you had $150 after two years, the interest rate, written as a decimal, would be found using the expression * 2/2
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End of Lesson 2 Assignment Lesson 3:2 Estimating Square Roots 10 - 33 All
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