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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 #11 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}9\\ -\ 5\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

9, 8, 7, 6, 5, 4

$\frac{\begin{array}[b]{r}9\\ -\ 5\end{array}}{ \ \ \ \space4}$

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Example Question #107 : Operations

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

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}11\\ -\ 6\end{array}}{ \ \ \ \space5}$

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Example Question #82 : Operations

$\frac{\begin{array}[b]{r}20\\ -\ 10\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back 10.

20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10

$\frac{\begin{array}[b]{r}20\\ -\ 10\end{array}}{ \ \ \ \space10}$

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Example Question #14 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}20\\ -\ 14\end{array}}{ \ \ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back 14.

20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6

$\frac{\begin{array}[b]{r}20\\ -\ 14\end{array}}{ \ \ \ \ \ \space6}$

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Example Question #83 : Operations

$\frac{\begin{array}[b]{r}19\\ -\ 4\end{array}}{ \ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

19, 18, 17, 16, 15

$\frac{\begin{array}[b]{r}19\\ -\ 4\end{array}}{ \ \ \space15}$

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Example Question #84 : Operations

$\frac{\begin{array}[b]{r}18\\ -\ 5\end{array}}{ \ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

18, 17, 16, 15, 14, 13

$\frac{\begin{array}[b]{r}18\\ -\ 5\end{array}}{ \ \ \space13}$

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Example Question #11 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}18\\ -\ 14\end{array}}{ \ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back 14.

18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4

$\frac{\begin{array}[b]{r}18\\ -\ 14\end{array}}{ \ \ \ \ \space4}$

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Example Question #92 : Operations

$\frac{\begin{array}[b]{r}17\\ -\ 2\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

17, 16, 15

$\frac{\begin{array}[b]{r}17\\ -\ 2\end{array}}{ \ \ \space15}$

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Example Question #92 : How To Subtract

$\frac{\begin{array}[b]{r}17\\ -\ 12\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5

$\frac{\begin{array}[b]{r}17\\ -\ 12\end{array}}{ \ \ \ \ \ \space5}$

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Example Question #93 : How To Subtract

$\frac{\begin{array}[b]{r}15\\ -\ 2\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

15, 14, 13

$\frac{\begin{array}[b]{r}15\\ -\ 2\end{array}}{ \ \ \space13}$

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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 #11 : Operations & Algebraic Thinking

Example Question #107 : Operations

Example Question #82 : Operations

Example Question #14 : Operations & Algebraic Thinking

Example Question #83 : Operations

Example Question #84 : Operations

Example Question #11 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #92 : Operations

Example Question #92 : How To Subtract

Example Question #93 : How To Subtract

All Common Core: 2nd Grade Math Resources

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