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Do Now 9/8/09
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– Text p.7-8 #12-48 multiples of 4
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Objective
SWBAT evaluate and write expressions
Section 1.1 “Expressions and
Variables”
Numerical expression
consists of numbers and
operations
Variable
a letter used to represent one or
more numbers.
Variable expression
consists of numbers,
variables, and operations.
To EVALUATE A VARIABLE
EXPRESSIONsubstitute a number for each
variable, perform the operations and
simplify, if necessary.
13 n = 13 3
= 39
Substitute 3 for n.
Multiply.
Evaluate the expression when n = 3.
a.
b.
9
n
= 9
3
Substitute 3 for n.
= 3
Divide.
n–1 = 3–1
= 2
Substitute 3 for n.
Subtract.
Evaluate the expression when y = 2.
c. 6 y
= 6 2
= 12
Substitute 2 for y.
Multiply.
d. y + 4
= 2+4
= 6
Substitute 2 for y..
Add.
Verbal model
describes a problem using
words as labels and using
math symbols to relate the
words
Common Words and Phrases that
Indicate Operations
Operation
Verbal Phrase
Addition
Sum, plus, total, more
than, increased by
5+n
Subtraction
Difference, less than,
minus, decreased by
12 – p
Product, times, of,
multiplied by
3x5
Multiplication
Expression
k + 12
3(d)
(n)(w)
Division
Quotient, divided by,
divided into
k/7
x – 12
p∙k
y
7
14 ÷ r
Translate verbal phrases into expressions
Verbal Phrase
Expression
a. 7 less than a number n
n–7
b. 3 times a number y
3y
c. the difference of a number x and the
square of a number m
x – m2
Guided Practice
Text p. 7, #1-10 all
Homework
Text p. 7-9, #12-48 multiples of 4