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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 #121 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}20\\ -\ 17\end{array}}{ \ \ \ \space ?}$

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, 6, 5, 4, 3

$\frac{\begin{array}[b]{r}20\\ -\ 17\end{array}}{ \ \ \ \ \ \space 3}$

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Example Question #201 : Operations

$\frac{\begin{array}[b]{r}19\\ -\ 15\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4

$\frac{\begin{array}[b]{r}19\\ -\ 15\end{array}}{ \ \ \ \ \ \space 4}$

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Example Question #201 : How To Subtract

$\frac{\begin{array}[b]{r}18\\ -\ 11\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}18\\ -\ 11\end{array}}{ \ \ \ \ \ \space 7}$

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Example Question #122 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}17\\ -\ 8\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}17\\ -\ 8\end{array}}{ \ \ \ \space 9}$

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Example Question #125 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}16\\ -\ 1\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

16,15

$\frac{\begin{array}[b]{r}16\\ -\ 1\end{array}}{ \ \ \space 15}$

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Example Question #202 : Operations

$\frac{\begin{array}[b]{r}15\\ -\ 12\end{array}}{ \ \ \ \space ?}$

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, 3

$\frac{\begin{array}[b]{r}15\\ -\ 12\end{array}}{ \ \ \ \ \ \space 3}$

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Example Question #127 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}13\\ -\ 12\end{array}}{ \ \ \ \space ?}$

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, 1

$\frac{\begin{array}[b]{r}13\\ -\ 12\end{array}}{ \ \ \ \ \ \space 1}$

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Example Question #123 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}10\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}10\\ -\ 6\end{array}}{ \ \ \ \space 4}$

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Example Question #211 : Operations

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

Possible Answers:

Correct answer:

Explanation:

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

1,0

$\frac{\begin{array}[b]{r}1\\ -\ 1\end{array}}{ \ \ \ \space 0}$

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Example Question #212 : Operations

$\frac{\begin{array}[b]{r}3\\ -\ 1\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

3,2

$\frac{\begin{array}[b]{r}3\\ -\ 1\end{array}}{ \ \ \ \space 2}$

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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 : 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 #121 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #201 : Operations

Example Question #201 : How To Subtract

Example Question #122 : Operations & Algebraic Thinking

Example Question #125 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #202 : Operations

Example Question #127 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #123 : Operations & Algebraic Thinking

Example Question #211 : Operations

Example Question #212 : Operations

All Common Core: 2nd Grade Math Resources

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