1 / 11

Algebraic Expressions

Algebraic Expressions. Everyday Math Lesson 10.3. Lesson Objectives. I can identify and use patterns in tables to solve problems I can write algebraic expressions to model rules I can use variables to write number models that describe situations. Mental Math. 4 + 7 30 + 70 50 + 60

ezra-pace
Télécharger la présentation

Algebraic Expressions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Algebraic Expressions Everyday Math Lesson 10.3

  2. Lesson Objectives • I can identify and use patterns in tables to solve problems • I can write algebraic expressions to model rules • I can use variables to write number models that describe situations

  3. Mental Math 4 + 7 30 + 70 50 + 60 84 + 7 30 + 78 150 + 260 84 + 47 30 + 778 152 + 263

  4. MathMessage( 3 minutes) Joe and Maria are 5th graders. Joe is 2 inches taller than Maria. Make a table of 4 possible heights for Joe and Maria.

  5. Math Message Follow-Up(5 minutes) • How tall is Joe? • What does his height depend upon? • How tall is Maria?

  6. Introducing Algebraic Expressions * The table of Maria and Joe’s height is similar to a “What’s My Rule?” table. • What was the rule for Maria and Joe’s table? • Let’s represent Joe’s height using an algebraic expression. (“M” represents Maria’s height) M + 2 M M + 2

  7. Turn to pg. 218 in your SRB. • Study the examples of expressions that algebraic and those that are not. • What’s the difference???? • Expressions use operation symbols (+, -, *, /) to combine numbers, but algebraic expressions combine variables and numbers. • KEY POINTS: • A situation can be represented in several ways (words, table, or symbols) • Algebraic expressions use variables and other symbols to represent situations • To evaluate an A.E means to substitute values for variables and solve.

  8. Practice!Propose algebraic expressions to fit the situations • Sue weighs 10 pounds less than Jamal. If J= Jamal’s weight, then J-10 represents Sue’s weight. • Isaac collected twice as many cans as Alex. If A= the number of cans Alex collected, then 2 * A, (or 2A) represents the number of cans Isaac collected. • There are half as many problems in today’s assignment as there were in yesterday’s. If Y= the number of problems in yesterday’s assignment, then there are ½ Y, ½ * Y, or Y/2 problems in today’s assignment.

  9. Algebraic Equations • Expressions can be combined with relation symbols (=, <, >) to make number sentences. • X + 2 = 15 • 3y + 7 < 100 * These are called “Algebraic Equations” (number sentences that contain algebraic expressions)

  10. Writing Algebraic Expressions • Turn to pg. 341 & 342 in your journal. • Let’s go over problem 1 • Complete the statements on both pages with a partner. • When you are finished, complete the “What’s My Rule” on pg. 343.

  11. Independent Work • On your own at a level 0, complete Math boxes on page 344. • When you are finished, you may work on Study Link 10.3

More Related