Addition And Subtraction Problems Worksheet Page 4
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40Algebra: Addition Properties
2-1
and Subtraction Rules
Carlos is buying the
items shown. Does the
order in which the
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cashier scans the items
change the total cost?
I will use addition
properties and
subtraction rules to
add and subtract.
Addition Properties
Key Concepts
New Vocabulary
Words
Commutative Property of Addition The order
Commutative
Property of Addition
in which numbers are added does not change
Associative Property
the sum.
of Addition
Examples
4 + 1 = 5
1 + 4 = 5
Identity Property of
Addition
Words
Associative Property of Addition The way in
which numbers are grouped when added does
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not change the sum.
Examples
(5 + 2) + 3
5 +
(2
+ 3)
Parentheses ( )
• Extra Examples
show which
• Personal Tutor
7
+ 3
5 +
5
numbers are
• Self-Check Quiz
added first.
10
10
Words
Identity Property of Addition The sum of any
number and 0 is the number.
Examples
8 + 0 = 8
0 + 8 = 8
Real-World
EXAMPLE
Use Addition Properties
1
MONEY
Does the order in which the camping supplies
are scanned change the total cost?
The Associative Property tells us that the way in which
numbers are grouped when added does not change the sum.
($20 + $15) + $10 = $20 + ($15 + $10)
($35 + $10) = $20 + $25
$45 = $45
Lesson 2-1 Algebra: Addition Properties and Subtraction Rules 55
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