# ARUSDG rade8 Warm Up Chapter3 by HC121104002213

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Warm-Up (Chapter 3.1)

Today’s Objective/Standards:
CST/CAHSEE:                       Review:

Translate the verbal phrase into   Solve and check:
a variable expression.

Seven less than nine times a
number                                  c – 31 = 14

A)   7n - 7
B)   70 - n
C)   9n - 7
D)   7 - 9n

Why can choice A, B and D be
eliminated?

Current:                       Other:

Write each phrase as a
Combine Like Terms:                variable expressions:
Simplify      z + 5y + 3 + y          The sum of twice a
number and 8

 The quotient of 25
and 5 times a number.

Format: PDG Jan. 2005
Name ____________

Warm Up (Chapter 3.2)
CST/CAHSEE:                          Review:

Which expression
represents a difference of
two numbers?

A)   6–y
B)   6+y
C)   6y
D)   6÷y
Prove why Choices A, B and C are
not the correct answers.           If a friend was absent on the
day this lesson was taught and
you were reviewing, why
would you recommend
eliminating Choice C and
Choice D?
Current:                          Other:
Which expression matches
the following phrase: one          Write an integer that
less than the product of a         represents the situation:
number and 3?
Seventeen degrees below
A.       n+3–1                   zero
B.       3n – 1
C.       n–3–1
D.       3(n – 1)
Today’s Objective/Standards:

Format: PDG Jan. 2005
Name ____________

Warm Up (Chapter 3.3)
CST/CAHSEE:                       Review:
You and a friend are on a        Use a number line to find
canoe trip. The trip is 56 miles the sum.
long. The first day you travel
18 miles. How many more
miles do you have to travel to
9 + (– 4)
complete the trip?

What other graphical
Write an equation model.        representation could be
Solve and justify your          used to find the correct
reasoning.                      answer?
Current:                        Other:

At 1 p.m. the temperature was   Find the sum.
67 and at 3 p.m. the
temperature was 86 . How        38 + (– 21) + 15
much did the temperature
increase by 3 p.m.?

Today’s Objective/Standards:

Format: PDG Jan. 2005
Name ____________

Warm Up (Chapter 3.4)
Today’s Objective/Standards:

CST/CAHSEE:                       Review:

Simplify the expression.
Then evaluate the
expression when x = 2

– x + 4x + 8

Your friend thinks either B or
C is the best answers. How
can you help your under that A
is the best answer?
Current:                       Other:

Which expression does not have Describe the patter. List
a value of -3?                 the next 3 numbers you
expect to find in the
a. – 2 + (– 1)               sequence.
b. –10 + (–7)
c. – 6 + 3                   10, 12, 15, 19, __, __, __
d.  3–3–3

Today’s Objective/Standards:

Format: PDG Jan. 2005
Name ____________

Warm Up (Chapter 3.5)
CST/CAHSEE:                         Review:

Find the difference:

– 5 – 10

What are two methods
Why can Choice A be easily     can be used to simplify?
eliminated?
Current:                         Other:

Find the value of the expression
Describe and correct the       a – b when a = 2 and b = –3.
error.
A.    –4
B.    –3
–9–8                             C.    –2
D.     0
= 9 + (– 8)
=+1

Today’s Objective/Standards:
Format: PDG Jan. 2005
Name ____________

Warm Up (Chapter 3.6)
CST/CAHSEE:                      Review:
The product of two positive
integers is always positive
(True or False)
Provide an example.

What choice would you
eliminate easily and why?

Current:                       Other:

The product of a positive      The product of two
and a negative integer is      negative integers is always
always negative (True or       negative (True or False)?
False)?
Provide an example             Provide an example

Today’s Objective/Standards:
Format: PDG Jan. 2005
Name ____________

Warm Up(Chapter 3.7)
CST/CAHSEE:                        Review:

Evaluate the expression
when x = – 3

Explain why Choices A, B
and C can be eliminated.

Current:                         Other:

Find the product:              Simplify:

(–7) (– 4)                 3x – 5– 2x

Today’s Objective/Standards:

Format: PDG Jan. 2005
Name ________________

Warm Up (Chapter 3.8)
CST/CAHSEE:                      Review:
Write an equivalent:
Evaluate the expression
when x = 5.

Why can Choice A and
Choice B be easily
eliminated?

Current:                           Other:

The absolute value of a
The sum of two negative      negative integer is the
integers is always negative? opposite of that integer?
Is the above statement true? True or False?
Use example to make the
statement true.              Prove why the statement is
true.

Today’s Objective/Standards:

Format: PDG Jan. 2005

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