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Common Core: 2nd Grade Math : Mentally Add and Subtract Within 20: CCSS.Math.Content.2.OA.B.2

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

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All Common Core: 2nd Grade Math Resources

7 Diagnostic Tests 217 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #122 : Operations

$\frac{\begin{array}[b]{r}15\\ -\ 11\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4

$\frac{\begin{array}[b]{r}15\\ -\ 11\end{array}}{ \ \ \ \ \ \space 4}$

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Example Question #41 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}14\\ -\ 10\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4

$\frac{\begin{array}[b]{r}14\\ -\ 10\end{array}}{ \ \ \ \ \ \space 4}$

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Example Question #42 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}13\\ -\ 2\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

13, 12, 11

$\frac{\begin{array}[b]{r}13\\ -\ 2\end{array}}{ \ \ \space 11}$

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Example Question #41 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}12\\ -\ 5\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

12, 11, 10, 9, 8, 7

$\frac{\begin{array}[b]{r}12\\ -\ 5\end{array}}{ \ \ \ \space 7}$

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Example Question #41 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}11\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

11, 10, 9, 8, 7, 6, 5

$\frac{\begin{array}[b]{r}11\\ -\ 6\end{array}}{ \ \ \ \space 5}$

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Example Question #122 : Operations

$\frac{\begin{array}[b]{r}10\\ -\ 3\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

10, 9, 8, 7

$\frac{\begin{array}[b]{r}10\\ -\ 3\end{array}}{ \ \ \ \space 7}$

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Example Question #41 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}9\\ -\ 7\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

9, 8, 7, 6, 5, 4, 3, 2

$\frac{\begin{array}[b]{r}9\\ -\ 7\end{array}}{ \ \ \ \space 2}$

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Example Question #48 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}9\\ -\ 9\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

9, 8,7 ,6 ,5 ,4, 3, 2, 1, 0

$\frac{\begin{array}[b]{r}9\\ -\ 9\end{array}}{ \ \ \ \space 0}$

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Example Question #49 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}8\\ -\ 5\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

8, 7, 6, 5, 4, 3

$\frac{\begin{array}[b]{r}8\\ -\ 5\end{array}}{ \ \ \ \space 3}$

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Example Question #42 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}7\\ -\ 5\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

7, 6, 5, 4, 3, 2

$\frac{\begin{array}[b]{r}7\\ -\ 5\end{array}}{ \ \ \ \space 2}$

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All Common Core: 2nd Grade Math Resources

7 Diagnostic Tests 217 Practice Tests Question of the Day Flashcards Learn by Concept

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Common Core: 2nd Grade Math : Mentally Add and Subtract Within 20: CCSS.Math.Content.2.OA.B.2

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

All Common Core: 2nd Grade Math Resources

Example Questions

Example Question #122 : Operations

Example Question #41 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #42 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #41 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #41 : Operations & Algebraic Thinking

Example Question #122 : Operations

Example Question #41 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #48 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #49 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #42 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

All Common Core: 2nd Grade Math Resources

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