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Common Core: 1st Grade Math : Common Core Math: Grade 1

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

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

Possible Answers:

Correct answer:

Explanation:

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

11, 10, 9, 8, 7

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

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Example Question #31 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

8, 7

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

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Example Question #32 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

19, 18, 17, 16, 15, 14

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

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Example Question #33 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

18, 17, 16, 15, 14, 13, 12, 11

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

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Example Question #34 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

17, 16, 15, 14, 13, 12, 11, 10

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

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Example Question #35 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

16,15,14,13

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

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Example Question #36 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

20, 19, 18, 17, 16, 15, 14, 13

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

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Example Question #131 : Operations & Algebraic Thinking

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

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, 5, 4, 3, 2, 1, 0

$\frac{\begin{array}[b]{r}17\\ -\ 17\end{array}}{ \ \ \ \space 0}$

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Example Question #11 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}17\\ -\ 9\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}17\\ -\ 9\end{array}}{ \ \ \ \space 8}$

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Example Question #41 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}16\\ -\ 5\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

16, 15, 14, 13, 12, 11

$\frac{\begin{array}[b]{r}16\\ -\ 5\end{array}}{ \ \ \space11}$

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All Common Core: 1st Grade Math Resources

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Common Core: 1st Grade Math : Common Core Math: Grade 1

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

All Common Core: 1st Grade Math Resources

Example Questions

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

Example Question #31 : Adding And Subtracting Within 20

Example Question #32 : Adding And Subtracting Within 20

Example Question #33 : Adding And Subtracting Within 20

Example Question #34 : Adding And Subtracting Within 20

Example Question #35 : Adding And Subtracting Within 20

Example Question #36 : Adding And Subtracting Within 20

Example Question #131 : Operations & Algebraic Thinking

Example Question #11 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #41 : Adding And Subtracting Within 20

All Common Core: 1st Grade Math Resources

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