5.OA.2
2011
Domain: Operations and Algebraic Thinking
Cluster: Write and interpret numerical expressions.
Standards: 2. Write simple expressions that record calculations with numbers, and interpret numerical expressions without
evaluating them. For example, express the calculation “add 8 and 7, then multiply by 2” as 2 × (8 + 7). Recognize that 3 × (18932 +
921) is three times as large as 18932 + 921, without having to calculate the indicated sum or product.
Essential Questions

How can you
translate words into
expressions?
Content Statements


Mathematics
content and
practices can be
applied to solve
problems.
Words can be
translated into
algebraic
expressions.
Enduring Understandings



Writing a number
expression is one way of
representing what we
know in a word problem.
Some mathematical
phrases can be
represented using a
variable in an algebraic
expression.
Make the connection
between mathematical
words and symbols used
in algebraic expressions.
Assessments

Write an expression for the steps “double five and
then add 26.”
Answer: (2 x 5) + 26

Describe how the expressions 5(10 x 10) relates to
Activities, Investigation, and Student Experiences
1. Students will compare the use of commas in word
sentences to the use of parentheses in number sentences.
Example: Add 5 and 3, and then multiply by 4.
(5 + 3) x 4
2. Students will read two similar number stories and match
each story with the correct expression.
Example: Ann backed 4 batches of 15 cookies and one
batch of 5 cookies. (4 x 15) + 5.
Ann baked 4 batches of 15 cookies, and then baked 5
more batches of 15 cookies. (4 x 15) + (5 x 15) or (4 + 5)
x 15.
3. Practice translating between words and algebraic
expressions. http://www.k5mathteachingresources.com/support-files/5.oa2.pdf
5.OA.2
2011
10 x 10.
Answer: The expression 5(10 x 10) is 5 times
larger than the expression 10 x 10 since I know
that 5(10 x 10) means that I have 5 groups of (10 x
10).
Equipment Needed:
Teacher Resources:
Student whiteboards

Calculators


Internet
Smartboard
Manipulatives
Overhead


http://www.k-5mathteachingresources.com/supportfiles/5.oa2.pdf
http://mathwire.com/games/numbsensegames.html
http://www.mathgoodies.com/lessons/vol7/order_oper
ations.html
http://teachers.henrico.k12.va.us/math/ms/c20708/01
NumberSense/1-3SimpNumExpres.html