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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 #271 : Operations & Algebraic Thinking

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

Possible Answers:

$\displaystyle 16$

$\displaystyle 13$

$\displaystyle 15$

$\displaystyle 14$

$\displaystyle 17$

Correct answer:

$\displaystyle 15$

Explanation:

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

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

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

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Example Question #1531 : Operations

$\frac{\begin{array}[b]{r}6\\ +\ 11\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}6\\ +\ 11\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 13$

$\displaystyle 15$

$\displaystyle 17$

$\displaystyle 16$

$\displaystyle 14$

Correct answer:

$\displaystyle 17$

Explanation:

To add we count up. Start at $\displaystyle 6$ and count up $\displaystyle 11$.

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

$\frac{\begin{array}[b]{r}6\\ +\ 11\end{array}}{ \ \ \ \space17}$ $\displaystyle \frac{\begin{array}[b]{r}6\\ +\ 11\end{array}}{ \ \ \ \space17}$

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Example Question #273 : Operations & Algebraic Thinking

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

Possible Answers:

$\displaystyle 12$

$\displaystyle 11$

$\displaystyle 10$

$\displaystyle 13$

$\displaystyle 14$

Correct answer:

$\displaystyle 13$

Explanation:

To add we count up. Start at $\displaystyle 1$ and count up $\displaystyle 12$.

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

$\frac{\begin{array}[b]{r}1\\ +\ 12\end{array}}{ \ \ \ \space13}$ $\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 12\end{array}}{ \ \ \ \space13}$

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Example Question #274 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}5\\ +\ 15\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 15\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 20$

$\displaystyle 5$

$\displaystyle 10$

$\displaystyle 12$

$\displaystyle 15$

Correct answer:

$\displaystyle 20$

Explanation:

To add we count up. Start at $\displaystyle 5$ and count up $\displaystyle 15$.

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

$\frac{\begin{array}[b]{r}5\\ +\ 15\end{array}}{ \ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 15\end{array}}{ \ \ \ \space20}$

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Example Question #275 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}1\\ +\ 19\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 19\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 18$

$\displaystyle 17$

$\displaystyle 20$

$\displaystyle 16$

$\displaystyle 19$

Correct answer:

$\displaystyle 20$

Explanation:

To add we count up. Start at $\displaystyle 1$ and count up $\displaystyle 19$.

$\displaystyle 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20$

$\frac{\begin{array}[b]{r}1\\ +\ 19\end{array}}{ \ \ \space20}$ $\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 19\end{array}}{ \ \ \space20}$

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Example Question #276 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}3\\ +\ 16\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 16\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 16$

$\displaystyle 18$

$\displaystyle 19$

$\displaystyle 15$

$\displaystyle 17$

Correct answer:

$\displaystyle 19$

Explanation:

To add we count up. Start at $\displaystyle 3$ and count up $\displaystyle 16$.

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

$\frac{\begin{array}[b]{r}3\\ +\ 16\end{array}}{ \ \ \space19}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 16\end{array}}{ \ \ \space19}$

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Example Question #1421 : Operations

$\frac{\begin{array}[b]{r}4\\ +\ 1\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}4\\ +\ 1\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 3$

$\displaystyle 8$

$\displaystyle 7$

$\displaystyle 6$

$\displaystyle 5$

Correct answer:

$\displaystyle 5$

Explanation:

To add we count up. Start at $\displaystyle 4$ and count up $\displaystyle 1$.

4,5 $\displaystyle 4,5$

$\frac{\begin{array}[b]{r}4\\ +\ 1\end{array}}{ \ \ \space5}$ $\displaystyle \frac{\begin{array}[b]{r}4\\ +\ 1\end{array}}{ \ \ \space5}$

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Example Question #278 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}15\\ +\ 2\end{array}}{ \ \ \space?}$ $\displaystyle \frac{\begin{array}[b]{r}15\\ +\ 2\end{array}}{ \ \ \space?}$

Possible Answers:

$\displaystyle 13$

$\displaystyle 14$

$\displaystyle 18$

$\displaystyle 17$

$\displaystyle 12$

Correct answer:

$\displaystyle 17$

Explanation:

To add we count up. Start at $\displaystyle 15$ and count up $\displaystyle 2$.

$\displaystyle 15,16,17$

$\frac{\begin{array}[b]{r}15\\ +\ 2\end{array}}{ \ \ \space17}$ $\displaystyle \frac{\begin{array}[b]{r}15\\ +\ 2\end{array}}{ \ \ \space17}$

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Example Question #279 : Operations & Algebraic Thinking

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

Possible Answers:

$\displaystyle 6$

$\displaystyle 10$

$\displaystyle 9$

$\displaystyle 7$

$\displaystyle 8$

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 #280 : Operations & Algebraic Thinking

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

Possible Answers:

$\displaystyle 9$

$\displaystyle 7$

$\displaystyle 6$

$\displaystyle 8$

$\displaystyle 10$

Correct answer:

$\displaystyle 6$

Explanation:

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

3,4,5,6 $\displaystyle 3,4,5,6$

$\frac{\begin{array}[b]{r}3\\ +\ 3\end{array}}{ \ \ \ \space6}$ $\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 3\end{array}}{ \ \ \ \space6}$

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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 #271 : Operations & Algebraic Thinking

Example Question #1531 : Operations

Example Question #273 : Operations & Algebraic Thinking

Example Question #274 : Operations & Algebraic Thinking

Example Question #275 : Operations & Algebraic Thinking

Example Question #276 : Operations & Algebraic Thinking

Example Question #1421 : Operations

Example Question #278 : Operations & Algebraic Thinking

Example Question #279 : Operations & Algebraic Thinking

Example Question #280 : Operations & Algebraic Thinking

All Common Core: 2nd Grade Math Resources

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