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2.4

2.4. Converting Numerical Expressions into Unit Form. Automaticity . Evaluate the following expressions. 11 x (15 + 5) (41 – 11) x 12 (75 + 25) x 38 (20 x 2) + (6 x 2). Review. Translate into expressions the sum of 9 and 8 times 3 the difference of 5 fifteens and 4 fifteens

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2.4

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  1. 2.4 Converting Numerical Expressions into Unit Form

  2. Automaticity Evaluate the following expressions. 11 x (15 + 5) (41 – 11) x 12 (75 + 25) x 38 (20 x 2) + (6 x 2)

  3. Review • Translate into expressions • the sum of 9 and 8 times 3 • the difference of 5 fifteens and 4 fifteens • 3 times the difference of 37 and 24 • Translate into mathematical phrases • 12 x (5 + 15) • 24 x (20 - 5) • (30 x 2) + (8 x 2)

  4. Objective SWBAT convert numerical expression into unit form by: Using mental math Using multi-digit multiplication Using a tape diagram

  5. Vocabulary Factor Estimate Product Unit form Decompose Tape Diagram- a tool used to visually represent a mathematical problem

  6. Application Problem Tommy earned $39 raking leaves. His brother, Jemos, earned 7 times as much waiting on tables. Write a numerical expression to show Jemos’ earnings. How much money did Jemos earn?

  7. Problems 1-2 Use a tape diagram to solve the following problems 8 x 31 8 x 29

  8. Problems 3-4 Which strategy would you use? 49 x 20 20 x 51

  9. Problems 5-6 Use a tape diagram to solve the following problems. Choose one of the two strategies. 101 x 12 12 x 98

  10. Problem Set 2.4 Complete problem set 2.4 Once you are done, compare your answers with the person next to you. You have 15 minutes to complete these problems. After 15 minutes is up, we share our answers.

  11. Objective SWBAT convert numerical expression into unit form by: Using mental math Using multi-digit multiplication Using a tape diagram

  12. Exit Ticket Complete the exit ticket

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