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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 #94 : How To Subtract

$\frac{\begin{array}[b]{r}14\\ -\ 2\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

14, 13, 12

$\frac{\begin{array}[b]{r}14\\ -\ 2\end{array}}{ \ \ \space12}$

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Example Question #96 : How To Subtract

$\frac{\begin{array}[b]{r}13\\ -\ 4\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

13, 12, 11, 10, 9

$\frac{\begin{array}[b]{r}13\\ -\ 4\end{array}}{ \ \ \ \space9}$

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Example Question #97 : How To Subtract

$\frac{\begin{array}[b]{r}12\\ -\ 3\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

12, 11, 10, 9

$\frac{\begin{array}[b]{r}12\\ -\ 3\end{array}}{ \ \ \ \space9}$

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Example Question #98 : How To Subtract

$\frac{\begin{array}[b]{r}10\\ -\ 5\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

10, 9, 8, 7, 6, 5

$\frac{\begin{array}[b]{r}10\\ -\ 5\end{array}}{ \ \ \ \space5}$

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Example Question #21 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}12\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

12, 11, 10, 9, 8

$\frac{\begin{array}[b]{r}12\\ -\ 4\end{array}}{ \ \ \ \space 8}$

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Example Question #22 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}11\\ -\ 1\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

11, 10

$\frac{\begin{array}[b]{r}11\\ -\ 1\end{array}}{ \ \ \ \space 10}$

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Example Question #23 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

Correct answer:

Explanation:

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

10, 9, 8, 7, 6, 5, 4, 3

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

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Example Question #24 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

Correct answer:

Explanation:

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

8, 7, 6, 5

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

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Example Question #21 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

7, 5, 4

$\frac{\begin{array}[b]{r}7\\ -\ 3\end{array}}{ \ \ \ \space 4}$

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Example Question #26 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

Correct answer:

Explanation:

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

6, 5, 4, 3, 2, 1, 0

$\frac{\begin{array}[b]{r}6\\ -\ 6\end{array}}{ \ \ \ \space 0}$

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All Common Core: 2nd Grade Math Resources

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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 #94 : How To Subtract

Example Question #96 : How To Subtract

Example Question #97 : How To Subtract

Example Question #98 : How To Subtract

Example Question #21 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #22 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #23 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #24 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #21 : Operations & Algebraic Thinking

Example Question #26 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

All Common Core: 2nd Grade Math Resources

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