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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

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Example Questions

Example Question #251 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}9\\ +\ 10\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}9\\ +\ 10\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 17$

$\displaystyle 19$

$\displaystyle 16$

$\displaystyle 18$

$\displaystyle 20$

Correct answer:

$\displaystyle 19$

Explanation:

To add we count up. Start at $\displaystyle 9$ and count up $\displaystyle 10$.

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

$\frac{\begin{array}[b]{r}9\\ +\ 10\end{array}}{ \ \ \ \space19}$ $\displaystyle \frac{\begin{array}[b]{r}9\\ +\ 10\end{array}}{ \ \ \ \space19}$

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Example Question #252 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}10\\ +\ 1\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 1\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 7$

$\displaystyle 8$

$\displaystyle 11$

$\displaystyle 9$

$\displaystyle 10$

Correct answer:

$\displaystyle 11$

Explanation:

To add we count up. Start at $\displaystyle 10$ and count up $\displaystyle 1$.

10,11 $\displaystyle 10,11$

$\frac{\begin{array}[b]{r}10\\ +\ 1\end{array}}{ \ \ \space11}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 1\end{array}}{ \ \ \space11}$

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Example Question #252 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}17\\ +\ 2\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}17\\ +\ 2\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 20$

$\displaystyle 19$

$\displaystyle 16$

$\displaystyle 15$

$\displaystyle 18$

Correct answer:

$\displaystyle 19$

Explanation:

To add we count up. Start at $\displaystyle 17$ and count up $\displaystyle 2$.

$\displaystyle 17,18,19$

$\frac{\begin{array}[b]{r}17\\ +\ 2\end{array}}{ \ \ \space19}$ $\displaystyle \frac{\begin{array}[b]{r}17\\ +\ 2\end{array}}{ \ \ \space19}$

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Example Question #253 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

$\displaystyle 11$

$\displaystyle 8$

$\displaystyle 12$

$\displaystyle 10$

$\displaystyle 9$

Correct answer:

$\displaystyle 9$

Explanation:

To add we count up. Start at $\displaystyle 6$ and count up $\displaystyle 3$.

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

$\frac{\begin{array}[b]{r}6\\ +\ 3\end{array}}{ \ \ \ \space9}$ $\displaystyle \frac{\begin{array}[b]{r}6\\ +\ 3\end{array}}{ \ \ \ \space9}$

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Example Question #254 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}6\\ +\ 4\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}6\\ +\ 4\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 7$

$\displaystyle 9$

$\displaystyle 8$

$\displaystyle 6$

$\displaystyle 10$

Correct answer:

$\displaystyle 10$

Explanation:

To add we count up. Start at $\displaystyle 6$ and count up $\displaystyle 4$.

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

$\frac{\begin{array}[b]{r}6\\ +\ 4\end{array}}{ \ \ \space10}$ $\displaystyle \frac{\begin{array}[b]{r}6\\ +\ 4\end{array}}{ \ \ \space10}$

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Example Question #255 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}14\\ +\ 5\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}14\\ +\ 5\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 19$

$\displaystyle 18$

$\displaystyle 15$

$\displaystyle 16$

$\displaystyle 17$

Correct answer:

$\displaystyle 19$

Explanation:

To add we count up. Start at $\displaystyle 14$ and count up $\displaystyle 5$.

$\displaystyle 14,15,16,17,18,19$

$\frac{\begin{array}[b]{r}14\\ +\ 5\end{array}}{ \ \ \space19}$ $\displaystyle \frac{\begin{array}[b]{r}14\\ +\ 5\end{array}}{ \ \ \space19}$

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Example Question #255 : Operations & Algebraic Thinking

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

Possible Answers:

$\displaystyle 14$

$\displaystyle 13$

$\displaystyle 16$

$\displaystyle 15$

$\displaystyle 12$

Correct answer:

$\displaystyle 14$

Explanation:

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

$\displaystyle 7,8,9,10,11,12,13,14$

$\frac{\begin{array}[b]{r}7\\ +\ 7\end{array}}{ \ \ \space14}$ $\displaystyle \frac{\begin{array}[b]{r}7\\ +\ 7\end{array}}{ \ \ \space14}$

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Example Question #256 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}9\\ +\ 8\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}9\\ +\ 8\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 17$

$\displaystyle 16$

$\displaystyle 18$

$\displaystyle 14$

$\displaystyle 15$

Correct answer:

$\displaystyle 17$

Explanation:

To add we count up. Start at and count up

$\displaystyle 9,10,11,12,13,14,15,16,17$

$\frac{\begin{array}[b]{r}9\\ +\ 8\end{array}}{ \ \ \space17}$ $\displaystyle \frac{\begin{array}[b]{r}9\\ +\ 8\end{array}}{ \ \ \space17}$

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Example Question #675 : How To Add

$\frac{\begin{array}[b]{r}4\\ +\ 10\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}4\\ +\ 10\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 15$

$\displaystyle 14$

$\displaystyle 17$

$\displaystyle 13$

$\displaystyle 16$

Correct answer:

$\displaystyle 14$

Explanation:

To add we count up. Start at $\displaystyle 4$ and count up $\displaystyle 10$.

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

$\frac{\begin{array}[b]{r}4\\ +\ 10\end{array}}{ \ \ \ \space14}$ $\displaystyle \frac{\begin{array}[b]{r}4\\ +\ 10\end{array}}{ \ \ \ \space14}$

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Example Question #676 : How To Add

$\frac{\begin{array}[b]{r}3\\ +\ 13\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 13\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 17$

$\displaystyle 16$

$\displaystyle 14$

$\displaystyle 13$

$\displaystyle 15$

Correct answer:

$\displaystyle 16$

Explanation:

To add we count up. Start at $\displaystyle 3$ and count up $\displaystyle 13$.

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

$\frac{\begin{array}[b]{r}3\\ +\ 13\end{array}}{ \ \ \ \space16}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 13\end{array}}{ \ \ \ \space16}$

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

Example Question #252 : Operations & Algebraic Thinking

Example Question #252 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #253 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #254 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #255 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #255 : Operations & Algebraic Thinking

Example Question #256 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #675 : How To Add

Example Question #676 : How To Add

All Common Core: 2nd Grade Math Resources

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