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Math Square Root Estimation Lesson

Learn how to estimate square roots to the nearest whole number with practical examples in finance. Practice order of operations and find interest rates.

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Math Square Root Estimation Lesson

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  1. Transparency 2 Click the mouse button or press the Space Bar to display the answers.

  2. Splash Screen

  3. Example 2-2b Objective Estimate square roots

  4. Example 2-2b Math Symbols Approximately 

  5. Lesson 2 Contents Example 1Estimate Square Roots Example 2Estimate Square Roots

  6. Estimate to the nearest whole number. Example 2-1a Write the problem Think of the perfect square less than 54 49 < < 7  7 = 49  64 Add the < sign Bring down Add the < sign Think of the perfect square greater than 54 8  8 = 64 1/2

  7. Estimate to the nearest whole number. Example 2-1a Determine which number 54 is closer to  49 <  54 <  64 54 - 49 = 5 64 - 54 = 10 54 is closer to 49 Answer: 7 So 54 is estimated to 7 1/2

  8. Estimate to the nearest whole number. Example 2-1b Answer: 8 1/2

  9. 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. Example 2-2a Write the problem 2/2

  10. Example 2-2a Follow order of operations P E MD AD Inside the parenthesis find the square root Bring down rest of expression 10.96 - 10 10.96 Subtract in numerator 10 .96 Divide numerator by denominator 10 Round to hundredths (2 places to the right of the decimal) 0.096 0.10 Remember: interest rate is percent so multiply decimal by 100 for percent 10% Answer: The interest rate = 10% 2/2

  11. 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 Example 2-2b * Answer: Interest rate = 20% 2/2

  12. End of Lesson 2 Assignment

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