Do Now 9/8/10
Take out HW from last night.
– Text p. 7-8, #12-30 evens, #42-48 evens
Copy HW in your planner.
– Text p. 8, #32-40, #49-51 all
In your journal, list as many “clue” words you
can think of that indicate a mathematical
operation. For example, the word ‘plus’ would
indicate the operation of addition.
Homework
Text p. 7-8, #12-30 evens, #42-48 evens
12). 9
14). 12
16). 120
18). 24
20). 6
22). 8
24). 32
26).
28).
30).
42).
44).
46).
48).
2
18
64
11.5
6
1
8.75
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.
Section 1.1 “Expressions and
Variables” Part 2
Verbal model
describes a problem using words
as labels and using math symbols to
relate the words
Writing Expressions
Operation
Verbal Phrase
Expression
Addition
Sum, plus, total,
more than,
increased by
5+n
Subtraction
Difference, less than,
minus, decreased by
12 – p
Multiplication
Product, times,
of, multiplied by
k + 12
3x5
3(d)
(n)(w)
Division
Quotient, divided by,
divided into
k/7
x – 12
y
7
p∙k
14 ÷ r
Translate verbal phrases into expressions
Verbal Phrase
a. 7 less than a number n
b. 3 times a number y
Expression
n–7
3y
c. the difference of a number x and the
number m
x–m
d. the sum of 12.5 and the number c
12.5 + c
e. the sum of 5 and the product of 6 and the
number f
5 + 6f
Homework
Text p. 8, #32-40, #49-51 all