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Common Core: 2nd Grade Math : Mentally Add and Subtract Within 20: CCSS.Math.Content.2.OA.B.2

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Example Questions

Example Question #391 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

$\displaystyle 14$

$\displaystyle 16$

$\displaystyle 17$

$\displaystyle 13$

$\displaystyle 15$

Correct answer:

$\displaystyle 14$

Explanation:

To add we count up. Start at $\displaystyle 12$ and count up $\displaystyle 2$.

$\displaystyle 12,13,14$

$\frac{\begin{array}[b]{r}12\\ +\ 2\end{array}}{ \ \ \space14}$ $\displaystyle \frac{\begin{array}[b]{r}12\\ +\ 2\end{array}}{ \ \ \space14}$

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Example Question #391 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

$\displaystyle 7$

$\displaystyle 5$

$\displaystyle 6$

$\displaystyle 4$

$\displaystyle 8$

Correct answer:

$\displaystyle 4$

Explanation:

To add we count up. Start at $\displaystyle 1$ and count up $\displaystyle 3$.

1,2,3,4 $\displaystyle 1,2,3,4$

$\frac{\begin{array}[b]{r}1\\ +\ 3\end{array}}{ \ \ \ \space4}$ $\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 3\end{array}}{ \ \ \ \space4}$

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Example Question #392 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}13\\ +\ 4\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}13\\ +\ 4\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 20$

$\displaystyle 19$

$\displaystyle 16$

$\displaystyle 18$

$\displaystyle 17$

Correct answer:

$\displaystyle 17$

Explanation:

To add we count up. Start at $\displaystyle 13$ and count up $\displaystyle 4$.

$\displaystyle 13,14,15,16,17$

$\frac{\begin{array}[b]{r}13\\ +\ 4\end{array}}{ \ \ \space17}$ $\displaystyle \frac{\begin{array}[b]{r}13\\ +\ 4\end{array}}{ \ \ \space17}$

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Example Question #394 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}10\\ +\ 5\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 5\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 14$

$\displaystyle 13$

$\displaystyle 11$

$\displaystyle 12$

$\displaystyle 15$

Correct answer:

$\displaystyle 15$

Explanation:

To add we count up. Start at $\displaystyle 10$ and count up $\displaystyle 5$.

$\displaystyle 10,11,12,13,14,15$

$\frac{\begin{array}[b]{r}10\\ +\ 5\end{array}}{ \ \ \space15}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 5\end{array}}{ \ \ \space15}$

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Example Question #392 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}11\\ +\ 4\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}11\\ +\ 4\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 13$

$\displaystyle 12$

$\displaystyle 15$

$\displaystyle 14$

$\displaystyle 16$

Correct answer:

$\displaystyle 15$

Explanation:

To add we count up. Start at $\displaystyle 11$ and count up $\displaystyle 4$.

$\displaystyle 11,12,13,14,15$

$\frac{\begin{array}[b]{r}11\\ +\ 4\end{array}}{ \ \ \space15}$ $\displaystyle \frac{\begin{array}[b]{r}11\\ +\ 4\end{array}}{ \ \ \space15}$

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Example Question #396 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}4\\ +\ 5\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}4\\ +\ 5\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 8$

$\displaystyle 9$

$\displaystyle 7$

$\displaystyle 6$

$\displaystyle 4$

Correct answer:

$\displaystyle 9$

Explanation:

To add we count up. Start at $\displaystyle 4$ and count up $\displaystyle 5$.

$\displaystyle 4,5,6,7,8,9$

$\frac{\begin{array}[b]{r}4\\ +\ 5\end{array}}{ \ \ \ \space9}$ $\displaystyle \frac{\begin{array}[b]{r}4\\ +\ 5\end{array}}{ \ \ \ \space9}$

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Example Question #397 : Operations & Algebraic Thinking

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

Possible Answers:

$\displaystyle 14$

$\displaystyle 17$

$\displaystyle 13$

$\displaystyle 15$

$\displaystyle 16$

Correct answer:

$\displaystyle 16$

Explanation:

To add we count up. Start at $\displaystyle 10$ and count up $\displaystyle 6$.

$\displaystyle 10,11,12,13,14,15,16$

$\frac{\begin{array}[b]{r}10\\ +\ 6\end{array}}{ \ \ \space16}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 6\end{array}}{ \ \ \space16}$

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Example Question #721 : How To Add

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

Possible Answers:

$\displaystyle 12$

$\displaystyle 13$

$\displaystyle 9$

$\displaystyle 10$

$\displaystyle 11$

Correct answer:

$\displaystyle 10$

Explanation:

To add we count up. Start at $\displaystyle 2$ and count up $\displaystyle 8$.

$\displaystyle 2,3,4,5,6,7,8,9,10$

$\frac{\begin{array}[b]{r}2\\ +\ 8\end{array}}{ \ \ \space10}$ $\displaystyle \frac{\begin{array}[b]{r}2\\ +\ 8\end{array}}{ \ \ \space10}$

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Example Question #1791 : Numbers And Operations

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

Possible Answers:

$\displaystyle 13$

$\displaystyle 14$

$\displaystyle 11$

$\displaystyle 15$

$\displaystyle 12$

Correct answer:

$\displaystyle 13$

Explanation:

To add we count up. Start at $\displaystyle 2$ and count up $\displaystyle 11$.

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

$\frac{\begin{array}[b]{r}2\\ +\ 11\end{array}}{ \ \ \space13}$ $\displaystyle \frac{\begin{array}[b]{r}2\\ +\ 11\end{array}}{ \ \ \space13}$

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Example Question #1791 : Numbers And Operations

$\frac{\begin{array}[b]{r}8\\ +\ 12\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 12\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 20$

$\displaystyle 19$

$\displaystyle 16$

$\displaystyle 18$

$\displaystyle 17$

Correct answer:

$\displaystyle 20$

Explanation:

To add we count up. Start at $\displaystyle 8$ and count up $\displaystyle 12$.

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

$\frac{\begin{array}[b]{r}8\\ +\ 12\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 12\end{array}}{ \ \ \ \space20}$

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

Example Question #391 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #392 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #394 : Operations & Algebraic Thinking

Example Question #392 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #396 : Operations & Algebraic Thinking

Example Question #397 : Operations & Algebraic Thinking

Example Question #721 : How To Add

Example Question #1791 : Numbers And Operations

Example Question #1791 : Numbers And Operations

All Common Core: 2nd Grade Math Resources

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