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

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

Possible Answers:

$\displaystyle 10$

$\displaystyle 9$

$\displaystyle 12$

$\displaystyle 13$

$\displaystyle 11$

Correct answer:

$\displaystyle 13$

Explanation:

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

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

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

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Example Question #711 : How To Add

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

Possible Answers:

$\displaystyle 14$

$\displaystyle 17$

$\displaystyle 18$

$\displaystyle 15$

$\displaystyle 16$

Correct answer:

$\displaystyle 16$

Explanation:

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

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

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

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Example Question #2031 : Common Core Math: Grade 2

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

Possible Answers:

$\displaystyle 19$

$\displaystyle 18$

$\displaystyle 16$

$\displaystyle 20$

$\displaystyle 17$

Correct answer:

$\displaystyle 20$

Explanation:

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

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

$\frac{\begin{array}[b]{r}10\\ +\ 10\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 10\end{array}}{ \ \ \ \space20}$

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Example Question #381 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

$\displaystyle 15$

$\displaystyle 16$

$\displaystyle 14$

$\displaystyle 13$

$\displaystyle 12$

Correct answer:

$\displaystyle 15$

Explanation:

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

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

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

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Example Question #717 : How To Add

$\frac{\begin{array}[b]{r}5\\ +\ 12\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 12\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 19$

$\displaystyle 17$

$\displaystyle 20$

$\displaystyle 16$

$\displaystyle 18$

Correct answer:

$\displaystyle 17$

Explanation:

To add we count up. Start at $\displaystyle 5$ and count up $\displaystyle 12$ .

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

$\frac{\begin{array}[b]{r}5\\ +\ 12\end{array}}{ \ \ \ \space17}$ $\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 12\end{array}}{ \ \ \ \space17}$

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Example Question #1561 : Operations

$\frac{\begin{array}[b]{r}6\\ +\ 14\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}6\\ +\ 14\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 16$

$\displaystyle 17$

$\displaystyle 18$

$\displaystyle 19$

$\displaystyle 20$

Correct answer:

$\displaystyle 20$

Explanation:

To add we count up. Start at $\displaystyle 6$ and count up $\displaystyle 14$ .

$\displaystyle 6,7,8,9,10,11,12,13,14,15,16,17,18,19,20$

$\frac{\begin{array}[b]{r}6\\ +\ 14\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}6\\ +\ 14\end{array}}{ \ \ \ \space20}$

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Example Question #381 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}3\\ +\ 15\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 15\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 16$

$\displaystyle 17$

$\displaystyle 18$

$\displaystyle 19$

$\displaystyle 20$

Correct answer:

$\displaystyle 18$

Explanation:

To add we count up. Start at $\displaystyle 3$ and count up $\displaystyle 15$

$\displaystyle 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18$

$\frac{\begin{array}[b]{r}3\\ +\ 15\end{array}}{ \ \ \ \space18}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 15\end{array}}{ \ \ \ \space18}$

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Example Question #712 : How To Add

$\frac{\begin{array}[b]{r}3\\ +\ 17\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 17\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 18$

$\displaystyle 17$

$\displaystyle 20$

$\displaystyle 19$

$\displaystyle 16$

Correct answer:

$\displaystyle 20$

Explanation:

To add we count up. Start at $\displaystyle 3$ and count up $\displaystyle 17$ .

$\displaystyle 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20$

$\frac{\begin{array}[b]{r}3\\ +\ 17\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 17\end{array}}{ \ \ \ \space20}$

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Example Question #1562 : Operations

$\frac{\begin{array}[b]{r}5\\ +\ 1\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 1\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 10$

$\displaystyle 8$

$\displaystyle 9$

$\displaystyle 6$

$\displaystyle 7$

Correct answer:

$\displaystyle 6$

Explanation:

To add we count up. Start at $\displaystyle 5$ and count up $\displaystyle 1$ .

5,6 $\displaystyle 5,6$

$\frac{\begin{array}[b]{r}5\\ +\ 1\end{array}}{ \ \ \ \space6}$ $\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 1\end{array}}{ \ \ \ \space6}$

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Example Question #383 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}18\\ +\ 1\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}18\\ +\ 1\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 16$

$\displaystyle 17$

$\displaystyle 20$

$\displaystyle 19$

$\displaystyle 18$

Correct answer:

$\displaystyle 19$

Explanation:

To add we count up. Start at $\displaystyle 18$ and count up $\displaystyle 1$ .

18,19 $\displaystyle 18,19$

$\frac{\begin{array}[b]{r}18\\ +\ 1\end{array}}{ \ \ \space19}$ $\displaystyle \frac{\begin{array}[b]{r}18\\ +\ 1\end{array}}{ \ \ \space19}$

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

Example Question #711 : How To Add

Example Question #2031 : Common Core Math: Grade 2

Example Question #381 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #717 : How To Add

Example Question #1561 : Operations

Example Question #381 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #712 : How To Add

Example Question #1562 : Operations

Example Question #383 : Operations & Algebraic Thinking

All Common Core: 2nd Grade Math Resources

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