This document provides a lesson on reading mathematical expressions that use letters to represent numbers. It includes examples of expressing mathematical expressions using words and circling vocabulary words that describe given expressions. Students are asked to list vocabulary words for expressions and write expressions using mathematical vocabulary. The lesson aims to help students read and understand expressions where letters stand in for numbers.

1. Lesson 15: Read Expressions inWhichLetters Standfor Numbers
Date: 3/25/15 S.61
61
© 2013 Common Core, Inc. Some rightsreserved. commoncore.org
This work is licensed under a
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 15
Lesson 15: Read Expressionsin Which Letters Stand for Numbers
Classwork
OpeningExercise
Complete the graphic organizer with mathematical words that indicateeach operation.Some words may not indicate
only one operation.
Example 1
Write an expression usingwords.
a. 𝑎 − 𝑏
b. 𝑥𝑦
ADDITION SUBTRACTION MULTIPLICATION DIVISION EXPONENTS

2. Lesson 15: Read Expressions inWhichLetters Standfor Numbers
Date: 3/25/15 S.62
62
© 2013 Common Core, Inc. Some rightsreserved. commoncore.org
This work is licensed under a
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 15
c. 4𝑓 + 𝑢
d. 𝑑 − 𝑏3
e. 5( 𝑢 − 10) + ℎ
f.
3
𝑑+𝑓
Exercises
Circleall thevocabulary words thatcould be used to describethe given expression.
1. 6ℎ − 10
2.
5𝑑
6
3. 5(2 + 𝑑) − 8
4. 𝑎𝑏𝑐
ADDITION SUBTRACTION MULTIPLICATION DIVISION
SUM DIFFERENCE PRODUCT QUOTIENT
ADD SUBTRACT MULTIPLY DIVIDE
MORE THAN LESS THAN TIMES EACH

3. Lesson 15: Read Expressions inWhichLetters Standfor Numbers
Date: 3/25/15 S.63
63
© 2013 Common Core, Inc. Some rightsreserved. commoncore.org
This work is licensed under a
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 15
Write an expression usingvocabulary to represent each given expression.
5. 8 − 2𝑔
6. 15( 𝑎 + 𝑐)
7.
𝑚+𝑛
5
8. 𝑏3
− 18
9. 𝑓 −
𝑑
2
10.
𝑢
𝑥

4. Lesson 15: Read Expressions inWhichLetters Standfor Numbers
Date: 3/25/15 S.64
64
© 2013 Common Core, Inc. Some rightsreserved. commoncore.org
This work is licensed under a
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
NYS COMMON CORE MATHEMATICS CURRICULUM 6•4Lesson 15
Problem Set
1. Listfive different vocabulary words thatcould be used to describeeach given expression.
a. 𝑎 − 𝑑 + 𝑐
b. 20 − 3𝑐
c.
𝑏
𝑑+2
2. Write an expression usingmath vocabulary for each expression below.
a. 5𝑏 − 18
b.
𝑛
2
c. 𝑎 + (𝑑 − 6)
d. 10 + 2𝑏