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2.8 – Undoing Operations

2.8 – Undoing Operations. Pages 144 - 150. Warmup. Please write the “Number Trick” in words and in math language, one step at a time. Give your answer at the end. Pick a number and then do the following operations in order: Add 3, multiply by 7, subtract 4, divide by 2, and add 1.

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2.8 – Undoing Operations

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  1. 2.8 – Undoing Operations Pages 144 - 150

  2. Warmup Please write the “Number Trick” in words and in math language, one step at a time. Give your answer at the end. Pick a number and then do the following operations in order: Add 3, multiply by 7, subtract 4, divide by 2, and add 1.

  3. I Bet I can Guess Your Starting Number. • Do you think that if you told somebody your final answer, they can guess your starting number? • Tell Mr. Schaner your final answer and see if he can guess your starting number. • Learning Target: • In Investigation 2.8: Just Undo It!, we will figure out how to find anyone’s starting number if they go through the steps (correctly) of the “number trick.”

  4. Investigation 2.8: Just Undo It! • We are going to solve an equation for x using a table. • Solve the following equationfor x. Undo Result 44 ? Pick a number 11 Divide by 4 Answer / 4 Answer + 4 Add 7 18 36 Answer 2 Multiply by 2 28 Answer 8 Subtract 8 Now let’s set this equation equal to 28 and solve for x.

  5. Partner Work: Do this problem with your partner • Solve the following by “undoing” the operations. • We start at x and work our way out to write the description • The number of rows needed = number of operations +1

  6. Did I Get That? – 2.8 • Using a table, find out what x is?

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