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Common Core: 2nd Grade Math : Operations & Algebraic Thinking

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 #161 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2

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

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Example Question #162 : Operations & Algebraic Thinking

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

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 #163 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

11,10,9

$\frac{\begin{array}[b]{r}11\\ -\ 2\end{array}}{ \ \ \ \space 9}$

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Example Question #247 : How To Subtract

$\frac{\begin{array}[b]{r}10\\ -\ 9\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

10, 9, 8, 7, 6, 5, 4, 3, 2, 1

$\frac{\begin{array}[b]{r}10\\ -\ 9\end{array}}{ \ \ \ \space 1}$

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Example Question #248 : How To Subtract

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

Possible Answers:

Correct answer:

Explanation:

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

7,6,5

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

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Example Question #161 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}14\\ -\ 9\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}14\\ -\ 9\end{array}}{ \ \ \ \space 5}$

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Example Question #162 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}20\\ -\ 12\end{array}}{ \ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}20\\ -\ 12\end{array}}{ \ \ \ \ \space 8}$

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Example Question #163 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}20\\ -\ 13\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}20\\ -\ 13\end{array}}{ \ \ \ \ \ \space 7}$

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Example Question #164 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}18\\ -\ 17\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1

$\frac{\begin{array}[b]{r}18\\ -\ 17\end{array}}{ \ \ \ \ \ \space 1}$

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Example Question #253 : How To Subtract

$\frac{\begin{array}[b]{r}17\\ -\ 11\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}17\\ -\ 11\end{array}}{ \ \ \ \ \space 6}$

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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 : 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 #161 : Operations & Algebraic Thinking

Example Question #162 : Operations & Algebraic Thinking

Example Question #163 : Operations & Algebraic Thinking

Example Question #247 : How To Subtract

Example Question #248 : How To Subtract

Example Question #161 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #162 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #163 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #164 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #253 : How To Subtract

All Common Core: 2nd Grade Math Resources

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