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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 #61 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}15\\ -\ 4\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}15\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 19$

$\displaystyle 9$

$\displaystyle 16$

$\displaystyle 10$

$\displaystyle 11$

Correct answer:

$\displaystyle 11$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 15$ and count back $\displaystyle 4$ .

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

$\frac{\begin{array}[b]{r}15\\ -\ 4\end{array}}{ \ \ \ \space 11}$ $\displaystyle \frac{\begin{array}[b]{r}15\\ -\ 4\end{array}}{ \ \ \ \space 11}$

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Example Question #61 : 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:

$\displaystyle 8$

$\displaystyle 11$

$\displaystyle 7$

$\displaystyle 9$

$\displaystyle 10$

Correct answer:

$\displaystyle 9$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 14$ and count back $\displaystyle 5$ .

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

$\frac{\begin{array}[b]{r}14\\ -\ 5\end{array}}{ \ \ \ \space 9}$ $\displaystyle \frac{\begin{array}[b]{r}14\\ -\ 5\end{array}}{ \ \ \ \space 9}$

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Example Question #62 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}13\\ -\ 5\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}13\\ -\ 5\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 9$

$\displaystyle 6$

$\displaystyle 7$

$\displaystyle 8$

$\displaystyle 10$

Correct answer:

$\displaystyle 8$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 13$ and count back $\displaystyle 5$ .

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

$\frac{\begin{array}[b]{r}13\\ -\ 5\end{array}}{ \ \ \ \space 8}$ $\displaystyle \frac{\begin{array}[b]{r}13\\ -\ 5\end{array}}{ \ \ \ \space 8}$

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Example Question #361 : Ssat Elementary Level Quantitative (Math)

$\frac{\begin{array}[b]{r}12\\ -\ 6\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}12\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 6$

$\displaystyle 3$

$\displaystyle 5$

$\displaystyle 18$

$\displaystyle 4$

Correct answer:

$\displaystyle 6$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 12$ and count back $\displaystyle 6$ .

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

$\frac{\begin{array}[b]{r}12\\ -\ 6\end{array}}{ \ \ \ \space 6}$ $\displaystyle \frac{\begin{array}[b]{r}12\\ -\ 6\end{array}}{ \ \ \ \space 6}$

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Example Question #61 : Operations & Algebraic Thinking

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

Possible Answers:

$\displaystyle 10$

$\displaystyle 9$

$\displaystyle 6$

$\displaystyle 7$

$\displaystyle 8$

Correct answer:

$\displaystyle 7$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 11$ and count back $\displaystyle 4$ .

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

$\frac{\begin{array}[b]{r}11\\ -\ 4\end{array}}{ \ \ \ \space 7}$ $\displaystyle \frac{\begin{array}[b]{r}11\\ -\ 4\end{array}}{ \ \ \ \space 7}$

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Example Question #66 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}8\\ -\ 1\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}8\\ -\ 1\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 4$

$\displaystyle 9$

$\displaystyle 7$

$\displaystyle 6$

$\displaystyle 5$

Correct answer:

$\displaystyle 7$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 8$ and count back $\displaystyle 1$ .

8, 7 $\displaystyle 8, 7$

$\frac{\begin{array}[b]{r}8\\ -\ 1\end{array}}{ \ \ \ \space 7}$ $\displaystyle \frac{\begin{array}[b]{r}8\\ -\ 1\end{array}}{ \ \ \ \space 7}$

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Example Question #62 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}19\\ -\ 5\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}19\\ -\ 5\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 14$

$\displaystyle 10$

$\displaystyle 13$

$\displaystyle 12$

$\displaystyle 11$

Correct answer:

$\displaystyle 14$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 19$ and count back $\displaystyle 5$ .

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

$\frac{\begin{array}[b]{r}19\\ -\ 5\end{array}}{ \ \ \space 14}$ $\displaystyle \frac{\begin{array}[b]{r}19\\ -\ 5\end{array}}{ \ \ \space 14}$

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Example Question #152 : Operations

$\frac{\begin{array}[b]{r}18\\ -\ 7\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}18\\ -\ 7\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 9$

$\displaystyle 7$

$\displaystyle 10$

$\displaystyle 11$

$\displaystyle 8$

Correct answer:

$\displaystyle 11$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 18$ and count back $\displaystyle 7$ .

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

$\frac{\begin{array}[b]{r}18\\ -\ 7\end{array}}{ \ \ \space 11}$ $\displaystyle \frac{\begin{array}[b]{r}18\\ -\ 7\end{array}}{ \ \ \space 11}$

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Example Question #62 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}17\\ -\ 7\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}17\\ -\ 7\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 13$

$\displaystyle 10$

$\displaystyle 11$

$\displaystyle 12$

Correct answer:

$\displaystyle 10$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 17$ and count back $\displaystyle 7$ .

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

$\frac{\begin{array}[b]{r}17\\ -\ 7\end{array}}{ \ \ \space 10}$ $\displaystyle \frac{\begin{array}[b]{r}17\\ -\ 7\end{array}}{ \ \ \space 10}$

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Example Question #151 : How To Subtract

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

Possible Answers:

$\displaystyle 13$

$\displaystyle 15$

$\displaystyle 11$

$\displaystyle 14$

$\displaystyle 12$

Correct answer:

$\displaystyle 13$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 16$ and count back $\displaystyle 3$ .

$\displaystyle 16,15,14,13$

$\frac{\begin{array}[b]{r}16\\ -\ 3\end{array}}{ \ \ \ \space 13}$ $\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 3\end{array}}{ \ \ \ \space 13}$

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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 #61 : Operations & Algebraic Thinking

Example Question #61 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #62 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #361 : Ssat Elementary Level Quantitative (Math)

Example Question #61 : Operations & Algebraic Thinking

Example Question #66 : Operations & Algebraic Thinking

Example Question #62 : Operations & Algebraic Thinking

Example Question #152 : Operations

Example Question #62 : Operations & Algebraic Thinking

Example Question #151 : How To Subtract

All Common Core: 2nd Grade Math Resources

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