What property is it?
(7 +3) +5=
associative property
21 + 6 =
6 +21 =
27
(8 +7) =4 =______
19
_____ + 5 = 17
12
100, 105, ____, 115, 120, ___130
110
125
18 +2 = 2 +18
commutative property
23 + 9 =____
_____+ ______ =______
32
9 +23 =32
(25 +6) +3 =_____
34
_____ - 6 =21
27
82, 84, _____, 88, ______, 92, 94
86
90
17 +0 = 17
identity property
31 + 8 = ____
_____ + ______ =_____
39
8 + 31 =_____
(4 +39) +7 =_______
50
29 - ______ =22
7
How many hundreds are in 325?
3
You can add two numbers in any order and the sum will always be the same.
Commutative Property
47 + 8 =______
______ +______= _______
55
8 + 47 = 55
(9 + 67) + 2 = ________
78
32 + _____ = 37
5
18 + 4 + 3=______
25
when three or more numbers are added, the sum is the same regardless of which numbers are added together first.
associative property
59 + 9 =
_____ + ______ =_______
68
______ + _______ =_______
(100 +12) + 5 =_______
117
103 + ______ = 109
6
Write the number one thousand, four hundred seventy three in number form.
1,473