Name
Chapter 6, Lesson 3
Reteach
Date
Properties of Addition and
Subtraction
CA Standards
AF 1.2, MR 1.1
Properties of Addition
Commutative Property
Associative Property
Identity Property
a+b=b+a
a + (b + c) = b + (a + c)
a+0=a
7+8=8+7
11 + (6 + 8) = 6 + (11 + 8)
Changing the order of the
addends does not change
the sum.
Regrouping the addends does
not change the sum.
8+0=8
0+8=8
The sum of any number and 0
is that number.
Complete. Identify the property or properties you used.
1.
32 +
= 32
2.
44 + 27 = 27 +
3.
(28 +
) + 16 = 28 + (41 + 16)
4.
39 + (45 + 11) = (39 + 11) +
Evaluate. Identify the property or properties you used.
5.
45 + (21 + 55)
6.
88 + u + 22, given u = 35
Writing Math How can you use the Commutative Property and
the Associative Property to arrange the numbers in the expression below
so that they are easy to add mentally?
56 + (92 + 44)
Reteach
Use with text pages 126–127.
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