chapter 1.4 opposites, integers & absolute value
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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
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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
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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
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There are different ways to express multiplication and division.
Multiplication: Different ways to show four times y.4(y)4 • y4y (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/n12 ÷ n
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VOCABULARYEvaluate – 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 cm2 Simplify
4 cm
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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 revealanswer
Click to revealanswer
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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 cm2
12
12
drag the red check to the yellow check to reveal the answer
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Frayer Model
Examples Nonexamples
Definition Characteristics
word
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Frayer Model
Examples Nonexamples
Definition Characteristics
opposite
numbers that are the same distance from zeroon a number line but inopposite directions
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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
ExamplesNonexamples
Definition Characteristics
absolute value
a number's distance from zero on the number line
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