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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 #151 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}8\\ -\ 2\end{array}}{ \ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

8,7,6

$\frac{\begin{array}[b]{r}8\\ -\ 2\end{array}}{ \ \ \ \space 6}$

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Example Question #232 : Operations

$\frac{\begin{array}[b]{r}18\\ -\ 12\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}18\\ -\ 12\end{array}}{ \ \ \ \ \space 6}$

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Example Question #151 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}19\\ -\ 17\end{array}}{ \ \ \ \ \space ?}$

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, 3, 2

$\frac{\begin{array}[b]{r}19\\ -\ 17\end{array}}{ \ \ \ \ \space 2}$

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Example Question #152 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}20\\ -\ 15\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}20\\ -\ 15\end{array}}{ \ \ \ \ \ \space 5}$

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Example Question #235 : How To Subtract

$\frac{\begin{array}[b]{r}12\\ -\ 2\end{array}}{ \ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

12,11,10

$\frac{\begin{array}[b]{r}12\\ -\ 2\end{array}}{ \ \ \space 10}$

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Example Question #236 : How To Subtract

$\frac{\begin{array}[b]{r}19\\ -\ 13\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}19\\ -\ 13\end{array}}{ \ \ \ \ \space 6}$

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Example Question #152 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}18\\ -\ 10\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}18\\ -\ 10\end{array}}{ \ \ \ \ \space 8}$

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Example Question #151 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

17,16

$\frac{\begin{array}[b]{r}17\\ -\ 1\end{array}}{ \ \ \space 16}$

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Example Question #151 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}16\\ -\ 13\end{array}}{ \ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3

$\frac{\begin{array}[b]{r}16\\ -\ 13\end{array}}{ \ \ \ \ \ \space 3}$

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Example Question #153 : Operations & Algebraic Thinking

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

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, 2, 1, 0

$\frac{\begin{array}[b]{r}15\\ -\ 15\end{array}}{ \ \ \ \ \space 0}$

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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 #151 : Operations & Algebraic Thinking

Example Question #232 : Operations

Example Question #151 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #152 : Operations & Algebraic Thinking

Example Question #235 : How To Subtract

Example Question #236 : How To Subtract

Example Question #152 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #151 : Operations & Algebraic Thinking

Example Question #151 : Operations & Algebraic Thinking

Example Question #153 : Operations & Algebraic Thinking

All Common Core: 2nd Grade Math Resources

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