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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 #71 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

20, 19, 18, 17, 16, 15, 14, 13

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

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Example Question #72 : Operations & Algebraic Thinking

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

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, 4, 3, 2, 1, 0

$\frac{\begin{array}[b]{r}17\\ -\ 17\end{array}}{ \ \ \ \space 0}$

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Example Question #73 : Operations & Algebraic Thinking

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

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

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

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Example Question #72 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}16\\ -\ 5\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

16, 15, 14, 13, 12, 11

$\frac{\begin{array}[b]{r}16\\ -\ 5\end{array}}{ \ \ \space11}$

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Example Question #74 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

15, 14, 13, 12, 11, 10, 9

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

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Example Question #75 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}14\\ -\ 7\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

14, 13, 12, 11, 10, 9, 8, 7

$\frac{\begin{array}[b]{r}14\\ -\ 7\end{array}}{ \ \ \ \space 7}$

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Example Question #76 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}14\\ -\ 12\end{array}}{ \ \ \ \space ?}$

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,

$\frac{\begin{array}[b]{r}14\\ -\ 12\end{array}}{ \ \ \ \ \ \space 2}$

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Example Question #71 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}13\\ -\ 9\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}13\\ -\ 9\end{array}}{ \ \ \ \space 4}$

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Example Question #77 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

12, 11

$\frac{\begin{array}[b]{r}12\\ -\ 1\end{array}}{ \ \ \space 11}$

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Example Question #73 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}11\\ -\ 8\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

11, 10, 9, 8, 7, 6, 5, 4, 3

$\frac{\begin{array}[b]{r}11\\ -\ 8\end{array}}{ \ \ \ \space 3}$

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All Common Core: 2nd Grade Math Resources

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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 #71 : Operations & Algebraic Thinking

Example Question #72 : Operations & Algebraic Thinking

Example Question #73 : Operations & Algebraic Thinking

Example Question #72 : Operations & Algebraic Thinking

Example Question #74 : Operations & Algebraic Thinking

Example Question #75 : Operations & Algebraic Thinking

Example Question #76 : Operations & Algebraic Thinking

Example Question #71 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #77 : Operations & Algebraic Thinking

Example Question #73 : Operations & Algebraic Thinking

All Common Core: 2nd Grade Math Resources

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