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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

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All Common Core: 1st Grade Math Resources

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Example Questions

Example Question #142 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}14\\ -\ 7\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

14, 13, 12, 11, 10, 9, 8, 7

$\frac{\begin{array}[b]{r}14\\ -\ 7\end{array}}{ \ \ \ \space 7}$

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Example Question #143 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}14\\ -\ 12\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2,

$\frac{\begin{array}[b]{r}14\\ -\ 12\end{array}}{ \ \ \ \ \ \space 2}$

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Example Question #144 : Common Core Math: Grade 1

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

12, 11

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

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Example Question #145 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}13\\ -\ 9\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

13, 12, 11, 10, 9, 8, 7, 6, 5, 4

$\frac{\begin{array}[b]{r}13\\ -\ 9\end{array}}{ \ \ \ \space 4}$

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Example Question #146 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}11\\ -\ 8\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

11, 10, 9, 8, 7, 6, 5, 4, 3

$\frac{\begin{array}[b]{r}11\\ -\ 8\end{array}}{ \ \ \ \space 3}$

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Example Question #147 : Common Core Math: Grade 1

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

10, 9, 8, 7, 6

$\frac{\begin{array}[b]{r}10\\ -\ 4\end{array}}{ \ \ \ \space 6}$

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Example Question #148 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}9\\ -\ 2\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

9,8,7

$\frac{\begin{array}[b]{r}9\\ -\ 2\end{array}}{ \ \ \ \space 7}$

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Example Question #149 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}8\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

8,7,6,5,4

$\frac{\begin{array}[b]{r}8\\ -\ 4\end{array}}{ \ \ \ \space 4}$

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Example Question #150 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}20\\ -\ 2\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

20, 19, 18

$\frac{\begin{array}[b]{r}20\\ -\ 2\end{array}}{ \ \ \space 18}$

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Example Question #51 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}20\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back .

20, 19, 18, 17, 16, 15, 14

$\frac{\begin{array}[b]{r}20\\ -\ 6\end{array}}{ \ \ \space 14}$

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All Common Core: 1st Grade Math Resources

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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 #142 : Common Core Math: Grade 1

Example Question #143 : Common Core Math: Grade 1

Example Question #144 : Common Core Math: Grade 1

Example Question #145 : Common Core Math: Grade 1

Example Question #146 : Common Core Math: Grade 1

Example Question #147 : Common Core Math: Grade 1

Example Question #148 : Common Core Math: Grade 1

Example Question #149 : Common Core Math: Grade 1

Example Question #150 : Common Core Math: Grade 1

Example Question #51 : Adding And Subtracting Within 20

All Common Core: 1st Grade Math Resources

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