• Is 2x15 is a sum or a product? Why?
.
.
• What else can you say about this expression?
5.
Create verbal translations of expressions.
6,
x
• Create as many different verbal translations of the expression as possible.• Write story problems to represent each expression.• Share verbal translations with the class.
Concept Extension
Lesson 16Part 1: IntroductionAlgebraic ExpressionsIn Lesson 15, you learned to write and evaluate expressions with numbers and operations. Now, take a look at this problem.Describe the expression 2x15 in words.Explore ItUse the math you know to solve the problem. What does the letter xstand for?Which operation is represented by 2x? What do you call the result of this operation? What operation does the 1sign show? What do you call the result of this operation?Explain what the whole expression represents.DevelopSkills and StrategiesCCSS6.EE.A.2a6.EE.A.2b6.EE.A.2can unknown numbermultiplicationproductadditionsum

L16: Algebraic Expressions
169
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Copying is not permitted.
Part 1: Introduction
Lesson 16
AT A GLANCE
Students will identify parts of an expression using
mathematical terms and view one or more parts of an
expression as a single entity.
STEP BY STEP
• Read Find Out More as a class.
• Write the expression 2
x
1
5 on the board. Circle
and label the variable term, the coefficient, and the
constant.
• Point out to students another way to show
multiplication is using “
?
” such as 2
?
x
.
• Read Reflect as a class. Clarify the operations being
used. [multiplication and evaluating a power]
• Ask student pairs or groups to share their
explanations as to why Claire was correct or
incorrect.
Visual Model
Study expressions with algebra tiles.
Materials:
algebra tiles
• Present students with algebra tiles. Introduce the
small square as one unit, the rectangular tile as
x,
and the large square as
x
2
. The red side represents
a negative, and the green side represents a
positive.
• Use tiles to model the following expressions:
2
x
1
5, 3
x
, 4,
x
2
1
1, 2
x
2
2
3
x
,
2
2
x
2
2
3, and
2
5.
• Write expressions for the following:
2 red rectangles and 3 small green squares
(
2
2
x
1
3)
4 green rectangles (4
x
)
3 large red squares (
2
3
x
2
)
• Explain to students that each grouping of tiles
represents a term in the expression.

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- Summer '19
- Sarah D
- Algebra, Algebraic Expressions