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Lesson 1 - Attachment A
IT’S MAGIC!
Write down any number.Add to it the number
that comes after it.
Add 9.Divide by 2.Subtract the number you
began with.
Intro to Expressions
Lesson 1 - Attachment A
Lesson 1 - Attachment A
Write an equation for the story.
There are 3 full boxes of pencils and 5 extra pencils. There are 41 pencils in all.
Lesson 1 - Attachment A
Write an equation for the story.
The pet store put the same number of hamsters in 6
cages. There are 48 hamsters total.
Lesson 1 - Attachment A
Write an equation for the story.
Lily had 14 beads and then lost some of them. She now
has 9 beads.
DefinitionsLesson 1 - Attachment A
Vocabulary word
Definition Example
Variable a letter or symbol that represents a number (unknown quantity).
8 + n = 12
Definitions
n + 5x – 7w - 25
Lesson 1 - Attachment A
A variable can use any letter of the alphabet.
DefinitionsLesson 1 - Attachment A
Vocabulary word
Definition Example
Algebraic Expression
a group of numbers, symbols, and variables that express an operation or a series of operations.
m + 8
r - 3
Lesson 1 - Attachment A
What’s True for All Numbers?465 + 137 = 137 + 465
DefinitionsLesson 1 - Attachment A
Vocabulary Definition Example
Evaluate an algebraic expression
to find the value of an algebraic expression by substituting numbers for variables.
•m + 8 m = 2 2 + 8 =10
DefinitionsLesson 1 - Attachment A
Vocabulary Definition Example
Simplify combine like terms and complete all operations
m = 2• m + 8 + m 2m + 8
•(2 x 2) + 8 4 + 8 12
Words That Lead to Addition
Lesson 1 - Attachment A
Sum More than
Increased
PlusAltogether
Words That Lead to Subtraction
Lesson 1 - Attachment A
Minus Decreased
How many more
LessDifference
Words That Lead to Multiplication
Lesson 1 - Attachment A
Triple Times
of
DoubleProduct
Words That Lead to Division
Lesson 1 - Attachment A
Divisor Into
DividendQuotient
Lesson 1 - Attachment A
Write Algebraic Expressions for These Word Phrases
Ten more than a number
A number decreased by five
6 less than a number
A number increased by eight
The sum of a number and 9
Four times a number
n + 10
w -5
x -6
n + 8
b + 9
4y
Lesson 1 - Attachment A
Write Algebraic Expressions for These Word Phrases
9 more than a number
The sum of a number and 6
A number b increased by 7
The quotient of 31 and a number
A number decreased by 1
A number tripled
x + 9
n + 6
b + 7
31 ÷ n
k - 1
3s
Lesson 1 - Attachment A
Algebraic Expression
Substitute Answer
x + 8 10 + 8 18x + 49 10 + 49 59x + x 10 + 10 207x 7(10) 7040 ÷ x 40 ÷ 10 4
Evaluate each algebraic expression when x = 10
You can write multiplication and division expressions without using the symbols and .
Instead of . . . You can write . . .
x 3 x 3
35 ÷ y
x(3) 3x
35y
When you are multiplying a number times a variable, the number is written first. Write “3x” not “x3.” Read 3x as “three x.”
Writing Math
Complete This Table
Lesson 1 - Attachment A
n n – 3
5
10
21
32
40
x x + 6
3
7
15
22
30
y 7y
3
8
11
20
50
s s ÷ 4
8
12
48
56
40
m 80/m
2
4
16
20
80
Write an Algebraic Expression for These Situations
Lesson 1 - Attachment A
Word Problem Algebraic Expression
Scott’s brother is 2 years younger than Scott.
The sum of two numbers is 12.
The difference between two numbers is 5.
