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4 th grade Ch 8.1 Solving expressions with variables

4 th grade Ch 8.1 Solving expressions with variables. AF 1.1. Objective:. We will solve expressions with variable. What are we going to do today?. APK. Order of Operations – Rules to simplify expressions!!!. Exponents. Parentheses. Multiply. Add. Subtract. Divide.

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4 th grade Ch 8.1 Solving expressions with variables

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  1. 4th gradeCh 8.1Solving expressions with variables AF 1.1

  2. Objective: • We will solve expressions with variable What are we going to do today?

  3. APK • Order of Operations – • Rules to simplify expressions!!! Exponents Parentheses Multiply Add Subtract Divide In your own words, what is the order of operations?

  4. APK • Order of Operations – rules that tell us which order to go!!! NOTE When we have multiplication and division in the same equation….go from left to right!!!! Ex: 16÷2 x 8 + 5 When we have adding and subtracting in the same equations…go from left to right! Ex: 3+ 4 – 10 x 5

  5. APK • Simplify the expressions: • (16 – 15) x (13 + 2) • 38 – 4 x (3 + 5)

  6. Concept Development • Variable – is a LETTER or SYMBOL that is used to stand for an unknown number. Example: (y + 2) x 10 50 – (6 x y) CFU: R-A-J What is a variable?

  7. Concept Development RAJ • Which one of these expressions has a variable? • A. (y+2) x 10 • B. 5 + 4 Show me with your white board • How did know that was the correct answer? Pair share Pick non volunteer

  8. Importance • By knowing how to solve expressions you will able to: • 1. find the answer • 2. know how to find higher level questions. • 3. will be able to pass the test • 4. Do well on CST. • Why is this important to you? • Pair share • Ask for volunteers CST Release question

  9. Steps: #1: Write the problem down #2: Replace the variable with the number #3: Use the order of operations to solve the problem Skill DevelopmentI do: • Using a brace map we will evaluate the expressions: y = 2 CFU How did I know to write 2 in for the y? How did I know which operation to use first? Pair share Pick non volunteers y = 5 Order of Operations: Parenthesis Exponents Multiply Divide Add Subtract

  10. Steps: #1: Write the problem down #2: Replace the variable with the number #3: Use the order of operations to solve the problem Skill DevelopmentWe do: • Using a brace map we will evaluate the expressions: CFU How did we know to write 2 in for the y? How did we know which operation to use first? Pair share Pick non volunteers y = 2 y = 5

  11. Steps: #1: Write the problem down #2: Replace the variable with the number #3: Use the order of operations to solve the problem Skill DevelopmentYou do: • Using a brace map we will evaluate the expressions: y = 2 Do on white board How did you know? How did you get that answer? y = 5

  12. Closure • What do we call a LETTER or SYMBOL that is used to stand for an unknown number? • On White Board • What did you learn about variables today? • Pair-share, volunteers

  13. Independent Practice • Worksheet. - Alternative Approach

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