Common Core: 2nd Grade Math : Operations & Algebraic Thinking
Study concepts, example questions & explanations for Common Core: 2nd Grade Math
All Common Core: 2nd Grade Math Resources
Example Questions
Example Question #431 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2
To subtract we can count backwards. Start at 
Example Question #432 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2
To add we count up. Start at 
Example Question #1 : Determine Even Or Odd Number Of Objects: Ccss.Math.Content.2.Oa.C.3
Is there an even or an odd number of dots below?
Both
Even
Odd
Neither
Odd
When trying to decide if we have an even or an odd number of items, we can put the items in pairs of two. If each item is in a pair, then we have an even number of items. If there is one item that isn't in a pair, then we have an odd number of items.
In this case, we have one dot not in a pair, so we have an odd number of dots.
Example Question #2 : Determine Even Or Odd Number Of Objects: Ccss.Math.Content.2.Oa.C.3
Is there an even or an odd number of dots below?
Neither
Odd
Even
Both
Even
When trying to decide if we have an even or an odd number of items, we can put the items in pairs of two. If each item is in a pair, then we have an even number of items. If there is one item that isn't in a pair, then we have an odd number of items.
In this case, our dots are in a pair of two, so we have an even number of dots.
Example Question #3 : Determine Even Or Odd Number Of Objects: Ccss.Math.Content.2.Oa.C.3
Is there an even or an odd number of dots below?
Neither
Odd
Both
Even
Odd
When trying to decide if we have an even or an odd number of items, we can put the items in pairs of two. If each item is in a pair, then we have an even number of items. If there is one item that isn't in a pair, then we have an odd number of items.
In this case, we have one dot. This dot is not in a pair, so we have an odd number of dots.
Example Question #4 : Determine Even Or Odd Number Of Objects: Ccss.Math.Content.2.Oa.C.3
Is there an even or an odd number of dots below?
Even
Neither
Odd
Both
Odd
When trying to decide if we have an even or an odd number of items, we can put the items in pairs of two. If each item is in a pair, then we have an even number of items. If there is one item that isn't in a pair, then we have an odd number of items.
In this case, we have one dot not in a pair, so we have an odd number of dots.
Example Question #5 : Determine Even Or Odd Number Of Objects: Ccss.Math.Content.2.Oa.C.3
Is there an even or an odd number of dots below?
Both
Odd
Neither
Even
Even
When trying to decide if we have an even or an odd number of items, we can put the items in pairs of two. If each item is in a pair, then we have an even number of items. If there is one item that isn't in a pair, then we have an odd number of items.
In this case, our dots are in pairs of two, so we have an even number of dots.
Example Question #6 : Determine Even Or Odd Number Of Objects: Ccss.Math.Content.2.Oa.C.3
Is there an even or an odd number of dots below?
Odd
Both
Neither
Even
Odd
When trying to decide if we have an even or an odd number of items, we can put the items in pairs of two. If each item is in a pair, then we have an even number of items. If there is one item that isn't in a pair, then we have an odd number of items.
In this case, we have one dot not in a pair, so we have an odd number of dots.
Example Question #7 : Determine Even Or Odd Number Of Objects: Ccss.Math.Content.2.Oa.C.3
Is there an even or an odd number of dots below?
Odd
Neither
Both
Even
Even
When trying to decide if we have an even or an odd number of items, we can put the items in pairs of two. If each item is in a pair, then we have an even number of items. If there is one item that isn't in a pair, then we have an odd number of items.
In this case, our dots are in pairs of two, so we have an even number of dots.
Example Question #8 : Determine Even Or Odd Number Of Objects: Ccss.Math.Content.2.Oa.C.3
Is there an even or an odd number of dots below?
Neither
Odd
Even
Both
Odd
When trying to decide if we have an even or an odd number of items, we can put the items in pairs of two. If each item is in a pair, then we have an even number of items. If there is one item that isn't in a pair, then we have an odd number of items.
In this case, we have one dot not in a pair, so we have an odd number of dots.
All Common Core: 2nd Grade Math Resources
