Estimate by rounding to find the answer
325
+264
------
300+300=600
330+260=590
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5
Which property is this?
(3+6)+2=3+(6+2)
Associative property
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15
How would you solve this using break apart?
47+52=___
40+50=90
7+2=9
90+9=99
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5
Which property is this?
4+5=5+4
Commutative property
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banana
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gift
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fairy
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15
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thief
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10
Which property is this?
73+32=32+73
Commutative property
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5
Which property is this?
567+0=567
Identity property/zero property
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10
Estimate the answer
579
-157
------
600-200=400
580-160=420
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15
Use mental math to solve:
56-21=_____
35
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10
Mrs Romo wants to buy 53 pencils. She already bought 21. Which number sentence shows how many more pencils she needs?
A) 21+___=53
B) 53+21=___
C) ___-21=53
D) 53-___=21
A or D
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thief
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gold
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fairy
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banana
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10
Which property is this?
123+(456+361)=(123+456)+361
Associative property
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10
Estimate by rounding to the nearest hundred
523
+274
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