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Do Now 10/19/10

Do Now 10/19/10. Take out HW from last night. Text p.66, #16-26 even, 28-31 all, 32- 46 evens Copy HW in your planner. Text p. 80-81, #1-5 all, #10-15 all; Do not simplify expressions. Quiz sections 2.1 & 2.3 Friday

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Do Now 10/19/10

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  1. Do Now 10/19/10 • Take out HW from last night. • Text p.66, #16-26 even, 28-31 all, 32- 46 evens • Copy HW in your planner. • Text p. 80-81, #1-5 all, #10-15 all; Do not simplify expressions. • Quiz sections 2.1 & 2.3 Friday • In your journal, compare and contrast a mathematical expression (number sentence) and a regular “word” sentence. • For example: “5 + 8 + 4 ” and “See spot run.”

  2. 16) 56 18) 7 20) -180 22) 4 24) x + 29 26) -48c 28) identity property of addition 29)commutative property of multiplication 30) associative property of addition 31) identity property of multiplication 32) 21,120 ft 34) 6 minutes 36) 308 Calories 38) 220,000 lb 40) No. You must always put on your socks before your shoes 42) 110 44) 300 46) 27 HomeworkText p.66, #16-26 even, 28-31 all, 32- 46 evens

  3. Objective • SWBAT identify the parts of variable expressions

  4. Section 2.3 “Simplifying Variable Expressions” Parts of an Expression -3x + 2x + 8 Terms of the expression are separated by addition signs Write expression as a sum “Opp-Opp” -4x – 3x + 7 -4x + (-3x) + 7

  5. Parts of an Expression Coefficient the number part of a variable term -3x + 2x + 8 The coefficient is always 1 for a variable with no number in front of it. Write expression as a sum “Opp-Opp” -x – 3x + 7 -1x + (-3x) + 7

  6. Parts of an Expression Constant term that has no variable -3x + 2x + 8 Write expression as a sum “Opp-Opp” 12x – 3 + x + 7 12x + (-3) + x + 7

  7. Parts of an Expression Like Terms terms that have the same variable -3x + 2x -3x + 2x + 8 Write expression as a sum “Opp-Opp” 12x – 3 + 2x + 7 12x + (-3) + 2x + 7 Constant terms are like terms.

  8. Parts of an Expression 7x + 5 + 3x + 8 1) List the terms of the expression. 7x, 5, 3x, 8 7, 3 2) List the coefficients of the expression. 8 3) List the constant terms of the expression. 4) List the like terms of the expression. 7x & 3x ; 5 & 8

  9. Parts of an Expression The coefficient is always 1 for a variable with no number in front of it. y + 8 – 5y – 3 Write expression as a sum “Opp-Opp” 1y + 8 + (-5y) + (-3) 1) List the terms of the expression. 1y, 8, -5y, -3 1, -5 2) List the coefficients of the expression. 8, -3 3) List the constant terms of the expression. 4) List the like terms of the expression. 1y & -5y ; 8 & -3

  10. ChallengeSimplify the Expression Can you make it easier to read? 7x + 5 + 3x + 8 7x + 3x + 5 + 8 10x + 13

  11. Homework 24 - Text p. 80-81, #1-5 all, #10-15 all; Do not simplify expressions.

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