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Common Core: 2nd Grade Math : Operations & Algebraic Thinking

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 #1741 : Common Core Math: Grade 2

$\frac{\begin{array}[b]{r}16\\ -\ 4\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 10$

$\displaystyle 11$

$\displaystyle 13$

$\displaystyle 12$

$\displaystyle 14$

Correct answer:

$\displaystyle 12$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 16$ and count back $\displaystyle 4$.

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

$\frac{\begin{array}[b]{r}16\\ -\ 4\end{array}}{ \ \ \space 12}$ $\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 4\end{array}}{ \ \ \space 12}$

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Example Question #172 : How To Subtract

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

Possible Answers:

$\displaystyle 12$

$\displaystyle 11$

$\displaystyle 10$

$\displaystyle 9$

$\displaystyle 13$

Correct answer:

$\displaystyle 12$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 15$ and count back $\displaystyle 3$.

$\displaystyle 15, 14, 13, 12$

$\frac{\begin{array}[b]{r}15\\ -\ 3\end{array}}{ \ \ \ \space 12}$ $\displaystyle \frac{\begin{array}[b]{r}15\\ -\ 3\end{array}}{ \ \ \ \space 12}$

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Example Question #391 : Ssat Elementary Level Quantitative (Math)

$\frac{\begin{array}[b]{r}14\\ -\ 4\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}14\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 9$

$\displaystyle 7$

$\displaystyle 10$

$\displaystyle 6$

$\displaystyle 8$

Correct answer:

$\displaystyle 10$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 14$ and count back $\displaystyle 4$.

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

$\frac{\begin{array}[b]{r}14\\ -\ 4\end{array}}{ \ \ \space 10}$ $\displaystyle \frac{\begin{array}[b]{r}14\\ -\ 4\end{array}}{ \ \ \space 10}$

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Example Question #91 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}13\\ -\ 7\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}13\\ -\ 7\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 7$

$\displaystyle 8$

$\displaystyle 9$

$\displaystyle 6$

$\displaystyle 5$

Correct answer:

$\displaystyle 6$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 13$ and count back $\displaystyle 7$.

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

$\frac{\begin{array}[b]{r}13\\ -\ 7\end{array}}{ \ \ \ \space 6}$ $\displaystyle \frac{\begin{array}[b]{r}13\\ -\ 7\end{array}}{ \ \ \ \space 6}$

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Example Question #1751 : Common Core Math: Grade 2

$\frac{\begin{array}[b]{r}12\\ -\ 11\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}12\\ -\ 11\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 5$

$\displaystyle 3$

$\displaystyle 1$

$\displaystyle 2$

$\displaystyle 4$

Correct answer:

$\displaystyle 1$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 12$ and count back $\displaystyle 11$.

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

$\frac{\begin{array}[b]{r}12\\ -\ 11\end{array}}{ \ \ \ \ \ \space 1}$ $\displaystyle \frac{\begin{array}[b]{r}12\\ -\ 11\end{array}}{ \ \ \ \ \ \space 1}$

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Example Question #91 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}10\\ -\ 8\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ -\ 8\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 1$

$\displaystyle 5$

$\displaystyle 2$

$\displaystyle 4$

$\displaystyle 3$

Correct answer:

$\displaystyle 2$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 10$ and count back $\displaystyle 8$.

$\displaystyle 10, 9, 8, 7, 6, 5, 4, 3, 2$

$\frac{\begin{array}[b]{r}10\\ -\ 8\end{array}}{ \ \ \ \space 2}$ $\displaystyle \frac{\begin{array}[b]{r}10\\ -\ 8\end{array}}{ \ \ \ \space 2}$

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Example Question #92 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}9\\ -\ 6\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}9\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 4$

$\displaystyle 6$

$\displaystyle 3$

$\displaystyle 2$

$\displaystyle 5$

Correct answer:

$\displaystyle 3$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 9$ and count back $\displaystyle 6$.

$\displaystyle 9, 8, 7, 6$

$\frac{\begin{array}[b]{r}9\\ -\ 6\end{array}}{ \ \ \ \space 3}$ $\displaystyle \frac{\begin{array}[b]{r}9\\ -\ 6\end{array}}{ \ \ \ \space 3}$

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Example Question #93 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

$\displaystyle 5$

$\displaystyle 7$

$\displaystyle 4$

$\displaystyle 6$

$\displaystyle 8$

Correct answer:

$\displaystyle 6$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 7$ and count back $\displaystyle 1$.

7,6 $\displaystyle 7,6$

$\frac{\begin{array}[b]{r}7\\ -\ 1\end{array}}{ \ \ \ \space 6}$ $\displaystyle \frac{\begin{array}[b]{r}7\\ -\ 1\end{array}}{ \ \ \ \space 6}$

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Example Question #91 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}20\\ -\ 3\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 3\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 14$

$\displaystyle 17$

$\displaystyle 15$

$\displaystyle 18$

$\displaystyle 15$

Correct answer:

$\displaystyle 17$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 20$ and count back $\displaystyle 3$.

$\displaystyle 20,19,18,17$

$\frac{\begin{array}[b]{r}20\\ -\ 3\end{array}}{ \ \ \space 17}$ $\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 3\end{array}}{ \ \ \space 17}$

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Example Question #1756 : Common Core Math: Grade 2

$\frac{\begin{array}[b]{r}20\\ -\ 19\end{array}}{ \ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 19\end{array}}{ \ \ \ \space ?}$

Possible Answers:

$\displaystyle 3$

$\displaystyle 5$

$\displaystyle 1$

$\displaystyle 2$

$\displaystyle 7$

Correct answer:

$\displaystyle 1$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 20$ and count back $\displaystyle 19$.

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

$\frac{\begin{array}[b]{r}20\\ -\ 19\end{array}}{ \ \ \ \ \ \space 1}$ $\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 19\end{array}}{ \ \ \ \ \ \space 1}$

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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

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Common Core: 2nd Grade Math : Operations & Algebraic Thinking

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

All Common Core: 2nd Grade Math Resources

Example Questions

Example Question #1741 : Common Core Math: Grade 2

Example Question #172 : How To Subtract

Example Question #391 : Ssat Elementary Level Quantitative (Math)

Example Question #91 : Operations & Algebraic Thinking

Example Question #1751 : Common Core Math: Grade 2

Example Question #91 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #92 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #93 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #91 : Operations & Algebraic Thinking

Example Question #1756 : Common Core Math: Grade 2

All Common Core: 2nd Grade Math Resources

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