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Natalia has 23 donuts. Danielle has 12 donuts. Which number sentence shows how many more donuts Natalia has? A) 12-23+___ B) 23-___=12 C) 12+___=23 D) 23-12=___
C or D
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
Estimate the answer 579 -157 ------
600-200=400 580-160=420
Estimate by rounding to find the answer 325 +264 ------
300+300=600 330+260=590
Which property is this? 0+271=271
Identity property/zero property
Which property is this? 123+(456+361)=(123+456)+361
Associative property
Which property is this? 73+32=32+73
Commutative property
Which property is this? 4+5=5+4
Commutative property
Which property is this? (3+6)+2=3+(6+2)
Associative property
Which property is this? 567+0=567
Identity property/zero property
How would you solve this using break apart? 47+52=___
40+50=90 7+2=9 90+9=99
Solve using mental math: 24+35=
59
Use mental math to solve: 56-21=_____
35
Solve by rounding to the nearest ten 87 -23 ------
90-20=70
Estimate by rounding to the nearest hundred 523 +274 -------
500+300=800