Vocabulary
This Addition Property states that if you add 0 to a number, the sum is the same as the given number
What is the Identity Property?
Solve.
151
+128
_______
151 = 100 + 50 + 1
128 = 100 + 20 + 8
__________________
= 279
Solve using the Mental Math strategy.
139 + 37
139 + 37
+1 -1
_________
140 + 36
176
10, 20, 30, 40, ____, _____, _____
The pattern increases by 10
10 more than 577
587
Symbols used to group numbers. They show how to group operations in a number sentence.
What are parentheses?
133
+ 99
________
133 = 100 + 30 + 3
99 = 90 + 9
__________________
= 232
Solve using Mental Math
37
+ 25
_____
37 + 25
+3 -3
40 + 22
62
100, 150, 200, 250, ____, ____, 400, ___
300, 350, 450
Increases by 50
100 more than 657
757
This Addition Property states that the order in which two numbers are added does not change the sum.
What is the Commutative Property?
767
+ 29
700 + 60 + 7
20 + 9
796
31 + 299
31 + 299
-1 +1
30 + 300
330
6,872; 7,872; ______; 9,872
7,872
Increases by 1,000
1,000 more than 5,869
6,869
This Addition Property states that the grouping of addends does not change the sum.
What is the Associative Property?
256
+ 125
____________
200 + 50 + 6
100 + 20 + 5
381
447 + 123
447 + 123
+ 3 -3
450 + 120
570
3,400; 3,500; 3,600 _____; ______; ______
3,700; 3,800; 3,900
Increase by 100
100 more than 1,345
1,445
Ordering or grouping numbers so they are easier to add in your head.
What is Mental Math?
214
+ 127
_____________
=
200 + 10 + 4
+ 100 + 20 + 7
______________
341
127 + 145
127 + 145
-5 +5
122 + 150
272
12,000; 10,000; 8,000; _____; _____; ______; ____
6,000; 4,000; 2,000; 0
Decrease by 2,000
_____ more than 5,834 is 6,934
1,000