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Name
Class
Practice 2-5
Date
Properties of Numbers
Name the property that each equation illustrates.
1.
83 + 6 = 6 + 83
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2.
15x + 15y = 15(x + y)
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3.
(8  7)  6 = 8  (7  6) ________________________________
4.
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5.
3(a + 2b) = 3a + 6b
6.
7 + (8 + 15) = (7 + 8) + 15
7.
x + (–x) = 0
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8.
16 + 0 = 16
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9.
0 = 30  0
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10.
wr = rw
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11.
-1· (-8) = 8
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Give a reason to justify each step.
12.
22.
Use mental math to simplify each expression.
13. 48 + 27 + 2 + 3
14. 10  8  3  10
15. Henry bought an apple for $0.75, some apricots for $1.50, some
cherries for $3.25, and three bananas for $1.50. Find the total cost of
the fruit.