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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 #131 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}6\\ -\ 3\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

6,5,4,3

$\frac{\begin{array}[b]{r}6\\ -\ 3\end{array}}{ \ \ \ \space 3}$

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Example Question #212 : Operations

$\frac{\begin{array}[b]{r}20\\ -\ 11\end{array}}{ \ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}20\\ -\ 11\end{array}}{ \ \ \ \ \ \space 9}$

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Example Question #213 : Operations

$\frac{\begin{array}[b]{r}19\\ -\ 12\end{array}}{ \ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}19\\ -\ 12\end{array}}{ \ \ \ \ \ \space 7}$

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Example Question #214 : Operations

$\frac{\begin{array}[b]{r}18\\ -\ 16\end{array}}{ \ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}18\\ -\ 16\end{array}}{ \ \ \ \ \ \space 2}$

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Example Question #211 : Operations

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

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, 2, 1, 0

$\frac{\begin{array}[b]{r}16\\ -\ 16\end{array}}{ \ \ \ \ \ \space 0}$

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Example Question #212 : Operations

$\frac{\begin{array}[b]{r}15\\ -\ 9\end{array}}{ \ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}15\\ -\ 9\end{array}}{ \ \ \ \ \space 6}$

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Example Question #137 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}14\\ -\ 13\end{array}}{ \ \ \ \ \ \space ?}$

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, 4, 3, 2, 1

$\frac{\begin{array}[b]{r}14\\ -\ 13\end{array}}{ \ \ \ \ \ \space 1}$

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Example Question #138 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}13\\ -\ 8\end{array}}{ \ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}13\\ -\ 8\end{array}}{ \ \ \ \ \space 5}$

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Example Question #221 : Operations

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

Possible Answers:

Correct answer:

Explanation:

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

5, 4, 3, 2, 1, 0

$\frac{\begin{array}[b]{r}5\\ -\ 5\end{array}}{ \ \ \ \ \space 0}$

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Example Question #140 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

7,6,5,4,3

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

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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 #131 : Operations & Algebraic Thinking

Example Question #212 : Operations

Example Question #213 : Operations

Example Question #214 : Operations

Example Question #211 : Operations

Example Question #212 : Operations

Example Question #137 : Operations & Algebraic Thinking

Example Question #138 : Operations & Algebraic Thinking

Example Question #221 : Operations

Example Question #140 : Operations & Algebraic Thinking

All Common Core: 2nd Grade Math Resources

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