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21 st Century Lessons

21 st Century Lessons. Evaluating Expression. Davis/Morton. Warm Up. OBJECTIVE: SWBAT evaluate algebraic expressions. Language Objective: SWBAT describe the steps to evaluating expressions. A magic store is selling exploding pens for $3 each plus $1 for tax.

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21 st Century Lessons

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  1. 21st Century Lessons Evaluating Expression Davis/Morton

  2. Warm Up OBJECTIVE: SWBAT evaluate algebraic expressions. Language Objective: SWBAT describe the steps to evaluating expressions. A magic store is selling exploding pens for $3 each plus $1 for tax. Kyle thinks you can figure out the cost of 10 pens with the below. numerical expression Quick Discussion: Algebraic Expression? Do you agree or disagree? Explain. 3p+1 Click to reveal next part Agenda

  3. Launch- Shopping with Marvin Marvin the Math Magician has a problem for you. He wants to buy some magic wands and some magician hats. The wands cost $8 each and $5 for each hat. How much will Marvin have to pay for 12 wands and 7 hats? Agenda

  4. Launch- Shopping with Marvin How did you get your answer? The wands cost $8 each and $5 for each hat. How much will Marvin have to pay for 12 wands and 7 hats? How can we write a to show our answer of 131? numerical expression Click to reveal next part Agenda

  5. Explore 1- Evaluating with Marvin How much will Marvin have to pay for 6 wands and 3 hats? Write an numerical expression to find the answer. Remember: the wands cost $8 each and $5 for each hat. Click to reveal next part Agenda

  6. Explore 1- Evaluating with Marvin The wands cost $8 each and $5 for each hat. Numerical Expression 7 7 12 12 12 wands 7 hats 3 3 6 6 6 wands 3 hats What changed in the two examples? Sometimes it helps to represent a problem as an algebraic expression. 8w+5h w= # of wands h= # of hats Click to reveal next part Agenda

  7. Explore 1- Evaluating with Marvin How much will Marvin have to pay for 10 wands and 2 hats? w = 10 h = 2 Algebraic Expression This is called substitution!! h w 2 10 We just evaluated the expression. Click to reveal next part evaluate Agenda

  8. Explore 1- Evaluating with Marvin Find the cost of buying 9 wands and 7 hats. Steps: 1. Copy the expression. 9 w= 7 h= h 7 w 9 2. Substitute the value in for the variable. 3. Evaluate using the order of operations. Click to reveal next part Agenda

  9. Solve when a=10 and b =7

  10. Exit Slip Kiara was asked to evaluate the expression . Her answer was 14. Did she substitute 11, 13, or 15? How do you know? Answer : 13 27 – 13 14 Agenda

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