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Warm-Up!
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Time’s
Me!
1. x + 8, if x = 5
ANS: 13
2.24 ÷ y, if y = 2
ANS: 12
Do Now!
Evaluate.
Warm-Ups Rock!
3.3z, if z = 3
ANS: 9
4.18 – 3m, if m = 3
ANS: 9
1-1 Variables and Expressions
Translate these expressions 
idk
omw
bff
jk
Translate
brb
TTyl
lol
rotfl
omg
Add
+
Sum
Plus
Added to
More than
Increased by
Total
Subtract
–
Difference
Minus
Subtracted from
Less
Less than
Decreased by
Multiply
x
Divide

Product of
Quotient
Times
Divided by
Multiplied by
Twice
Of
*Key Words!*
Write
*Writing algebraic expressions*
*Vocabulary Check*
1. Variable — is a letter or symbol used to represent a
value that can change.
Example: x
y
n
2. Algebraic Expressions — contain variables,
numbers, and one or more operations, but NO
equal signs.
3x –7
x+7
3. Evaluate — to evaluate an expression means to find
its value.
4. Term – May be a number, a varible, or a product or
quotient of numbers and variables.
Example: 5x
0.1d
7
Write
Example: 5x
Vocabulary Continued
• 5. Factors- Are the quantities being multiplied
together.
*Understanding powers!*
Write
Exponent
5
8
BASE
You say it like,
“8 to the 5th
power!”
Exponents
31
3 to the first power
32
3 to the second power or 3 squared 3 ∙ 3
33
3 to the third power or 3 cubed
3∙3∙3
34
3 to the fourth power
3∙3∙3∙3
2x6
2 times x to the sixth power
2∙x∙x∙x∙x∙x∙x
3
*Key Words!*
Write
*evaluating exponents*
Translate into an algebraic expression.
Eight increased by a number
8
Step 1:
Step 2:
Step 3:
Step 4:
+
n
Underline “Key Words”
Determine which operation you’ll use (+, -, x, )
Replace with numbers and/or variables!
Check your work! Does it sound like it makes sense?
Example #1
Write
*Writing algebraic expressions*
*Writing algebraic expressions*
Write
Translate into an algebraic expression.
Seven times x squared
7
Step 1:
Step 2:
Step 3:
Step 4:
∙
x2
Underline “Key Words”
Determine operation you’ll use (+, -, x, )
Replace with numbers and/or variables!
Check your work! Does it sound like it makes sense?
Example #1
Translate into an algebraic expression.
The sum of c squared and 21 times d
21d
+
c2
c2 + 21d
Step 1:
Step 2:
Step 3:
Step 4:
Underline “Key Words”
Determine operation you’ll use (+, -, x, )
Replace with numbers and/or variables!
Check your work! Does it sound like it makes sense?
Example #2
Write
*Writing algebraic expressions*
For key words like more than, less than, and
subtracted from, the numbers and variables
should be reversed to make sense.
Eight more than a number
8
8
Example #3
n
+
+
n
Reverse it!
Write
*important Note*
7 less than a number
7–
n
n – 7
Hmm… a
tough one!
Example #4
Write
*writing algebraic expressions*
Three-fourths of the perimeter p
¾
∙
3
p
4
Example #5
p
Write
*writing algebraic expressions*
*translate to a algebraic expression!*
Do It!
5 times a number
*translate to a algebraic expression!*
Do It!
th
x to the 18 power
Lets Practice
Translate into an algebraic expression.
2. Three fourths of a number.
ANS: ¾ x
3. The quotient of 9 and a number.
9
ANS:
x
Math Rock!
Do Now!
1. The difference between 24 and x.
ANS: 24 – x
Think –Pair -Share
• Explain the difference between an algebraic
expression and a verbal expression.
Algebraic expressions include
variables, numbers, and symbols.
Verbal expressions contain words
H.O.T. Problem
• Define a variable to represent a real-life
quantity, such as time in minutes or distance
in feet. Then use the variable to write an
algebraic expression to represent one of your
daily activities. Describe in words what your
expression represents, and explain your
reasoning.
You can do it!
• Jim and Julie are writing algebraic expression
for three times the sum of n squared and
three. Is either of them correct. Explain your
reasoning.
Jim
3(n2  3)
Julie
3n 2  3
Jim is correct, Julie left out the parentheses around the n^2 +3
*Classwork*
*Time!*
Get Ready!
HW: page 7 #11-27 odd,
34-36 ALL
Write Homework!
Homework Time