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Common Core: 1st Grade Math : Adding and Subtracting Within 20: CCSS.MATH.CONTENT.1.OA.C.6

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Example Questions

Example Question #1 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}19\\ -\ 3\end{array}}{ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}19\\ -\ 3\end{array}}{ \ \ \space ?}$

Possible Answers:

$\displaystyle 17$

$\displaystyle 15$

$\displaystyle 14$

$\displaystyle 16$

$\displaystyle 13$

Correct answer:

$\displaystyle 16$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 19$ and count back $\displaystyle 3$.

$\displaystyle 19,18,17,16$

$\frac{\begin{array}[b]{r}19\\ -\ 3\end{array}}{ \ \ \space 16}$ $\displaystyle \frac{\begin{array}[b]{r}19\\ -\ 3\end{array}}{ \ \ \space 16}$

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Example Question #2 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}18\\ -\ 2\end{array}}{ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}18\\ -\ 2\end{array}}{ \ \ \space ?}$

Possible Answers:

$\displaystyle 18$

$\displaystyle 17$

$\displaystyle 15$

$\displaystyle 14$

$\displaystyle 16$

Correct answer:

$\displaystyle 16$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 18$ and count back $\displaystyle 2$.

$\displaystyle 18, 17, 16$

$\frac{\begin{array}[b]{r}18\\ -\ 2\end{array}}{ \ \ \space 16}$ $\displaystyle \frac{\begin{array}[b]{r}18\\ -\ 2\end{array}}{ \ \ \space 16}$

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Example Question #3 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}17\\ -\ 5\end{array}}{ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}17\\ -\ 5\end{array}}{ \ \ \space ?}$

Possible Answers:

$\displaystyle 14$

$\displaystyle 15$

$\displaystyle 13$

$\displaystyle 12$

$\displaystyle 11$

Correct answer:

$\displaystyle 12$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 17$ and count back $\displaystyle 5$.

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

$\frac{\begin{array}[b]{r}17\\ -\ 5\end{array}}{ \ \ \space 12}$ $\displaystyle \frac{\begin{array}[b]{r}17\\ -\ 5\end{array}}{ \ \ \space 12}$

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Example Question #4 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}16\\ -\ 8\end{array}}{ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 8\end{array}}{ \ \ \space ?}$

Possible Answers:

$\displaystyle 7$

$\displaystyle 6$

$\displaystyle 9$

$\displaystyle 8$

$\displaystyle 10$

Correct answer:

$\displaystyle 8$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 16$ and count back $\displaystyle 8$.

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

$\frac{\begin{array}[b]{r}16\\ -\ 8\end{array}}{ \ \ \ \space 8}$ $\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 8\end{array}}{ \ \ \ \space 8}$

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Example Question #5 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}16\\ -\ 10\end{array}}{ \ \ \space ?}$ $\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 10\end{array}}{ \ \ \space ?}$

Possible Answers:

$\displaystyle 10$

$\displaystyle 8$

$\displaystyle 7$

$\displaystyle 6$

$\displaystyle 9$

Correct answer:

$\displaystyle 6$

Explanation:

To subtract we can count backwards. Start at $\displaystyle 16$ and count back $\displaystyle 10$.

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

$\frac{\begin{array}[b]{r}16\\ -\ 10\end{array}}{ \ \ \ \ \ \space 6}$ $\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 10\end{array}}{ \ \ \ \ \ \space 6}$

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Example Question #6 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

$\displaystyle 7$

$\displaystyle 9$

$\displaystyle 11$

$\displaystyle 8$

$\displaystyle 10$

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 #7 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

$\displaystyle 9$

$\displaystyle 8$

$\displaystyle 10$

$\displaystyle 11$

$\displaystyle 12$

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 #8 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

$\displaystyle 9$

$\displaystyle 5$

$\displaystyle 7$

$\displaystyle 8$

$\displaystyle 6$

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 #1 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

$\displaystyle 6$

$\displaystyle 8$

$\displaystyle 4$

$\displaystyle 5$

$\displaystyle 7$

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 #6 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

$\displaystyle 8$

$\displaystyle 6$

$\displaystyle 7$

$\displaystyle 9$

$\displaystyle 10$

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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Common Core: 1st Grade Math : Adding and Subtracting Within 20: CCSS.MATH.CONTENT.1.OA.C.6

Study concepts, example questions & explanations for Common Core: 1st Grade Math

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #1 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #2 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #3 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #4 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #5 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #6 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #7 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #8 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #1 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #6 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

All Common Core: 1st Grade Math Resources

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