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# Chapter 1.4 Opposites, Integers & Absolute Value

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### Chapter 1.4 Opposites, Integers & Absolute Value

1. 1. Agenda Oct. 28 DO NOW Homework Check Substitution Integers & Absolute Value - use frayer model vocabulary templates Homework 25 PreAl p. 20 # 7 - 15, 22, 24, 26, 31 - 34, 40 - 46 Daily Scribe: Today Tomorrow Monday Tuesday
2. 2. p. 32 # 32 - 44HW CHECK 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
3. 3. 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
4. 4. There are different ways to express multiplication and division. Multiplication: 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
5. 5. 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
6. 6. 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
7. 7. Example 2: Find the area of a triangle if the base is 5 cm and the height is 4 cm. Remember to label! A = (5)(4) A = (20) A = 10 cm 2 1 2 1 2 drag the red check to the yellow check to reveal the answer
8. 8. Frayer Model Examples Nonexamples Definition Characteristics word
9. 9. Frayer Model Examples Nonexamples Definition Characteristics opposite numbers that are the same distance from zero on a number line but in opposite directions
10. 10. Frayer Model Examples Nonexamples Definition Characteristics integer the whole numbers and their opposites whole numbers are 0, 1, 2 ,...
11. 11. Frayer Model Examples Nonexamples Definition Characteristics absolute value a number's distance from zero on the number line