everything and its nan

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

all matter is made of what 

• energy 
• atoms 
• electrons 
• compounds 

the central region of an atom where its neutrons and protons are is its 

• nucleus 
• electron cloud
• core 
• center 

an atom with atomic number 6 would have how many protons 

• 6
• 12
• 3
• cannot be determined 

Particles in an atom that are neutral and have no charge are 

• negatrons 
• electrons 
• neutrons 
• protons 

What is the sum?
664+223

• 887
• 886
• 441
• 431

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Kate found 19 berries and Miranda found 21 berries. How many berries did they find altogether?

• 30
• 40
• 20
• 2

Tags

CCSS.2.OA.A.1

Add 518+336=

• 1254
• 800
• 182
• 854

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

    509 
+134

• 643
• 608
• 618
• 708

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

222+325

• 347
• 547
• 207
• 627

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2