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# Chapter 1.4 Opposites, Integers & Absolute Value

## on Oct 28, 2010

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## Chapter 1.4 Opposites, Integers & Absolute ValueDocument Transcript

• Agenda Oct. 28 DO NOW Homework Check Substitution Integers & Absolute Value - use frayer model vocabulary templates Ho mework 25 PreAl p. 20 # 7 - 15, 22, 24, 26, 31 - 34, 40 - 46 Da ily Scribe: Today Tomorrow Monday Tuesday
• p. 32 # 32 - 44 32. -49 - 75 = -124 33. -65 - 15 = -80 34. 16 - (-3) = 19 35. 120 - (-50) = 170 36. 989 - 76 = 913 37. -35 - 25 = -60 38. -92 - (-9) = -83 39. -81 - (-13) = -68 40. 36 - 88 = -52 41. -90 - (-80) - 20 = -30 42. 810 - 30 - (-70)=850 43. 23 - (-15) - 28 = 10 44. -17 + 25 - (-58) = 66 HW CHECK
• Sort the expression in the light blue box into one of the three categories. Variable Variable Expression Numerical Expression 82 + w g - 6 30/p 17 - 2 + 5 24 + 2 x 4 y x k m 18s (5 + 9)/7
• There are different ways to express multiplication and division. Mu ltiplication: Different ways to show four times y . 4(y) 4 • y 4y (The number is always written before the variable.) ( 4)(y) 4 x y (Try to avoid 4 x y because you may confuse the variable x and the times symbol x.) Division: Different ways to show twelve divided by n . 12/n 12 ÷ n
• VOCABULARY Evaluate – to evaluate a variable expression, you write the expression, substitute (replace) a number for each variable, and simplify. EVALUATING EXPRESSIONS What is the Area of this triangle? A = 1/2bh Variable Expression A = 1/2( 4 )( 12 ) Substitute numbers for variables 12cm A = 24 cm 2 Simplify 4 cm
• Example 1: Identify the variable. Evaluate the variable expression when y = 3. A. 27y B. -12/y + 8 27y -12/y + 8 27( 3 ) -12/ 3 + 8 -4 + 8 81 4 Click to reveal answer Click to reveal answer
• Example 2: Find the area of a triangle if the base is 5 cm and the height is 4 cm. Remember to label! drag the red check to the yellow check to reveal the answer A = (5)(4) A = (20) A = 10 cm 2 1 2 1 2
• Frayer Model Examples Nonexamples Definition Characteristics word
• Frayer Model Examples Nonexamples Definition Characteristics opposite numbers that are the same distance from zero on a number line but in opposite directions
• Frayer Model Examples Nonexamples Definition Characteristics integer the whole numbers and their opposites whole numbers are 0, 1, 2 ,...
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• Frayer Model Examples Nonexamples Definition Characteristics absolute value a number's distance from zero on the number line
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