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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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All Common Core: 2nd Grade Math Resources

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Example Questions

Example Question #421 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}3\\ +\ 14\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 14\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 17$

$\displaystyle 19$

$\displaystyle 20$

$\displaystyle 16$

$\displaystyle 18$

Correct answer:

$\displaystyle 17$

Explanation:

To add we count up. Start at $\displaystyle 3$ and count up $\displaystyle 14$.

$\displaystyle 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17$

$\frac{\begin{array}[b]{r}3\\ +\ 14\end{array}}{ \ \ \ \space17}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 14\end{array}}{ \ \ \ \space17}$

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Example Question #422 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}1\\ +\ 15\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 15\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 16$

$\displaystyle 19$

$\displaystyle 18$

$\displaystyle 20$

$\displaystyle 17$

Correct answer:

$\displaystyle 16$

Explanation:

To add we count up. Start at $\displaystyle 1$ and count up $\displaystyle 15$.

$\displaystyle 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16$

$\frac{\begin{array}[b]{r}1\\ +\ 15\end{array}}{ \ \ \ \space16}$ $\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 15\end{array}}{ \ \ \ \space16}$

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Example Question #423 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}3\\ +\ 12\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 12\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 15$

$\displaystyle 14$

$\displaystyle 17$

$\displaystyle 13$

$\displaystyle 16$

Correct answer:

$\displaystyle 15$

Explanation:

To add we count up. Start at $\displaystyle 3$ and count up $\displaystyle 12$.

$\displaystyle 3,4,5,6,7,8,9,10,11,12,13,14,15$

$\frac{\begin{array}[b]{r}3\\ +\ 12\end{array}}{ \ \ \ \space15}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 12\end{array}}{ \ \ \ \space15}$

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Example Question #424 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

$\displaystyle 14$

$\displaystyle 16$

$\displaystyle 15$

$\displaystyle 18$

$\displaystyle 17$

Correct answer:

$\displaystyle 17$

Explanation:

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

$\displaystyle 4,5,6,7,8,9,10,11,12,13,14,15,16,17$

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

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Example Question #425 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

$\displaystyle 14$

$\displaystyle 10$

$\displaystyle 13$

$\displaystyle 12$

$\displaystyle 11$

Correct answer:

$\displaystyle 10$

Explanation:

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

8,9,10 $\displaystyle 8,9,10$

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

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Example Question #426 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}12\\ +\ 4\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}12\\ +\ 4\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 18$

$\displaystyle 16$

$\displaystyle 19$

$\displaystyle 17$

$\displaystyle 20$

Correct answer:

$\displaystyle 16$

Explanation:

To add we count up. Start at $\displaystyle 12$ and count up $\displaystyle 4$.

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

$\frac{\begin{array}[b]{r}12\\ +\ 4\end{array}}{ \ \ \space16}$ $\displaystyle \frac{\begin{array}[b]{r}12\\ +\ 4\end{array}}{ \ \ \space16}$

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Example Question #427 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}8\\ +\ 5\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 5\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 13$

$\displaystyle 10$

$\displaystyle 12$

$\displaystyle 14$

$\displaystyle 11$

Correct answer:

$\displaystyle 13$

Explanation:

To add we count up. Start at $\displaystyle 8$ and count up $\displaystyle 5$.

$\displaystyle 8,9,10,11,12,13$

$\frac{\begin{array}[b]{r}8\\ +\ 5\end{array}}{ \ \ \space13}$ $\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 5\end{array}}{ \ \ \space13}$

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Example Question #428 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

$\displaystyle 12$

$\displaystyle 11$

$\displaystyle 13$

$\displaystyle 9$

$\displaystyle 10$

Correct answer:

$\displaystyle 11$

Explanation:

To add we count up. Start at $\displaystyle 4$ and count up $\displaystyle 7$.

$\displaystyle 4,5,6,7,8,9,10,11$

$\frac{\begin{array}[b]{r}4\\ +\ 7\end{array}}{ \ \ \space11}$ $\displaystyle \frac{\begin{array}[b]{r}4\\ +\ 7\end{array}}{ \ \ \space11}$

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Example Question #429 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

$\displaystyle 14$

$\displaystyle 11$

$\displaystyle 13$

$\displaystyle 12$

$\displaystyle 15$

Correct answer:

$\displaystyle 12$

Explanation:

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

$\displaystyle 6,7,8,9,10,11,12$

$\frac{\begin{array}[b]{r}6\\ +\ 6\end{array}}{ \ \ \space12}$ $\displaystyle \frac{\begin{array}[b]{r}6\\ +\ 6\end{array}}{ \ \ \space12}$

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Example Question #430 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}3\\ +\ 8\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 8\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 12$

$\displaystyle 11$

$\displaystyle 10$

$\displaystyle 8$

$\displaystyle 9$

Correct answer:

$\displaystyle 11$

Explanation:

To add we count up. Start at $\displaystyle 3$ and count up $\displaystyle 8$.

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

$\frac{\begin{array}[b]{r}3\\ +\ 8\end{array}}{ \ \ \space11}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 8\end{array}}{ \ \ \space11}$

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

Example Question #422 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #423 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #424 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #425 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #426 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #427 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #428 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #429 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #430 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

All Common Core: 2nd Grade Math Resources

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