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Working with the Graphing Calculator Before we even kick off this new school year, let’s take a moment to investigate the graphing calculators. For many of you, this is your first time working with the calculator. It is a powerful tool that can really assist us in solving problems, but only if we know how to use them! Follow along with this activity to help familiarize yourself with the calculator functions. I. Turning on and off the calculator. ON – ON (lower left corner) OFF – 2ND (yellow button) ON II. Basic Operations. Follow this activity to familiarize yourself with basic operations. Try three different numbers and record your results in the table. Pick any number. Add 30. Multiply by 5. Subtract 100. Now double it. Divide by 10. Subtract your original number. Your # Result What do you notice about the result?? III. Exponents. a. Squaring a number – if the exponent is just 2, there is a shortcut key. Follow the steps to find 272: 2 7 x2 = ______ Evaluate the following: 10 5 – 22 2 = ______ 2 32 5 3 1 = ______ b. All other exponents. Follow the steps to find 75: 7 ^ 5 = ______ 18 2 3 3 4 Evaluate the following: 18 2 3 3 4 = ______ 24 – 8 4 + 72 = ______ IV. Parentheses. Parentheses are often used in expressions to group values. Luckily, the calculator offers parentheses buttons. If the expression has them, you must plug them into your calculator! Follow the steps to find (-8)2: ( - 8 ) x2 = ______ Evaluate the following: (-11)2 = ______ (-7 + 4)2 = ______ (-18/3)2= ______ -112 = ______ -7 + 42= ______ -18/32 = ______ What did you find out about using/not using parentheses? Does it make a difference in your answer? Explain. ____________________________________________________________ ____________________________________________________________ ____________________________________________________________ V. Decimals and Fractions: a. Fraction to Decimal – Just use the division key to obtain the decimal. Follow the steps to change 3 / 8 = 3 to a decimal: 8 ______ b. Decimal to Fraction – Follow the steps to change 0.68 to a fraction: . 6 8 MATH ENTER ENTER = ______ Convert the following to fractions: 1.24 = ______ -3.2 = ______ 2.125 = ______ -1.166666666666 = ______ 1.75 = ______ -5.1111111111111 = ______