Variable and Expressions / Writing and Evaluating Expressions
What is a variable? What is a variable expression?
A variable is a letter that stands for a number
A variable expression is a mathematical phrase that uses variables, numerals and operation symbols
What "word" do we use for the order of operations?
PEMDAS
-40+93
53
3(-8)
-24
How do you write a coordinate pair?
(x,y)
Write a variable expression for: 4 fewer than j
j-4
Simplify: [2+(6*8)]-1
49
-20-(-65)
45
(-12)(-8)
96
Which quadrant is (7,-9) in?
4
Evaluate 41-4h, for h=10
1
Write a number to represent: a debt of $50
-50
-94 + 68 + (-22) + (-13)
-61
Write the sum as a product and then simplify the product.
(-9) + (-9) + (-9) + (-9) + (-9)
5(-9)
-45
PQRS is a square. Find the coordinate of S.
P(-5,0), Q(0,5), R(5,0)
S(0,-5)
Evaluate j(5+k), for j=11 and k=4
99
Order the numbers from least to greatest: -2, 8, -9, |-9|
-9, -2, 8, |-9|
-10-2
-12
Find the average football yardage: 10 yd, -5 yd, 7 yd, 9 yd, -11 yd
2 yd
Are x and y positive or negative in each quadrant?
1: both positive
2: - x and +y
3: both negative
4. +x and -y
Write an expression for the number of kilometers a dolphin travels in d hours swimming at 8km/h. Then find the number of kilometers the dolphin travels in 3 hours.
Let d = distance traveled
Let h = number of hours swam
d=8h
24 km in 3 hours
Insert grouping symbols to make the following number sentence true.
3+8-2*5=45
(3+8-2)*5=45
810-30-(-70)
850
Compare: (-9)(-6) and 8(-10)
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Draw a coordinate plane and then graph the following points: (3, -1) (0,-4) (5,1) and (-2,6)
Mrs. Herr will check for accuracy