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Common Core: 1st Grade Math : Adding and Subtracting Within 20

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

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All Common Core: 1st Grade Math Resources

7 Diagnostic Tests 180 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #671 : How To Subtract

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

Possible Answers:

Correct answer:

Explanation:

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

12, 11, 10, 9, 8

$\frac{\begin{array}[b]{r}12\\ -\ 4\end{array}}{ \ \ \ \space 8}$

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Example Question #671 : Operations

$\frac{\begin{array}[b]{r}11\\ -\ 2\end{array}}{ \ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

11,10,9

$\frac{\begin{array}[b]{r}11\\ -\ 2\end{array}}{ \ \ \ \space 9}$

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Example Question #131 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}10\\ -\ 9\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

10, 9, 8, 7, 6, 5, 4, 3, 2, 1

$\frac{\begin{array}[b]{r}10\\ -\ 9\end{array}}{ \ \ \ \space 1}$

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Example Question #132 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

7,6,5

$\frac{\begin{array}[b]{r}7\\ -\ 2\end{array}}{ \ \ \ \space 5}$

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Example Question #891 : Ssat Elementary Level Quantitative (Math)

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

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

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Example Question #901 : Ssat Elementary Level Quantitative (Math)

$\frac{\begin{array}[b]{r}20\\ -\ 12\end{array}}{ \ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8

$\frac{\begin{array}[b]{r}20\\ -\ 12\end{array}}{ \ \ \ \ \space 8}$

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Example Question #901 : Ssat Elementary Level Quantitative (Math)

$\frac{\begin{array}[b]{r}20\\ -\ 13\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7

$\frac{\begin{array}[b]{r}20\\ -\ 13\end{array}}{ \ \ \ \ \ \space 7}$

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Example Question #131 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}18\\ -\ 17\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1

$\frac{\begin{array}[b]{r}18\\ -\ 17\end{array}}{ \ \ \ \ \ \space 1}$

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Example Question #681 : Operations

$\frac{\begin{array}[b]{r}17\\ -\ 11\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}17\\ -\ 11\end{array}}{ \ \ \ \ \space 6}$

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Example Question #112 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}16\\ -\ 7\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

16, 15, 14, 13, 12, 11, 10, 9

$\frac{\begin{array}[b]{r}16\\ -\ 7\end{array}}{ \ \ \ \space 9}$

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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

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

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #671 : How To Subtract

Example Question #671 : Operations

Example Question #131 : Adding And Subtracting Within 20

Example Question #132 : Adding And Subtracting Within 20

Example Question #891 : Ssat Elementary Level Quantitative (Math)

Example Question #901 : Ssat Elementary Level Quantitative (Math)

Example Question #901 : Ssat Elementary Level Quantitative (Math)

Example Question #131 : Adding And Subtracting Within 20

Example Question #681 : Operations

Example Question #112 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

All Common Core: 1st Grade Math Resources

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