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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

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Example Questions

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Example Question #71 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0

$\frac{\begin{array}[b]{r}19\\ -\ 19\end{array}}{ \ \ \ \space 0}$

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Example Question #72 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}18\\ -\ 8\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}18\\ -\ 8\end{array}}{ \ \ \space 10}$

Report an Error

Example Question #73 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}17\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

17, 16, 15, 14, 13

$\frac{\begin{array}[b]{r}17\\ -\ 4\end{array}}{ \ \ \space 13}$

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Example Question #74 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

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

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

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Example Question #51 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}15\\ -\ 8\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

15, 14, 13, 12, 11, 10, 9, 8, 7

$\frac{\begin{array}[b]{r}15\\ -\ 8\end{array}}{ \ \ \ \space 7}$

Report an Error

Example Question #52 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}14\\ -\ 3\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

14,13,12,11

$\frac{\begin{array}[b]{r}14\\ -\ 3\end{array}}{ \ \ \space 11}$

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Example Question #53 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

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

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

Report an Error

Example Question #54 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}19\\ -\ 9\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

19, 18, 17, 16, 15, 14, 13, 12, 11, 10

$\frac{\begin{array}[b]{r}19\\ -\ 9\end{array}}{ \ \ \space 10}$

Report an Error

Example Question #55 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

Correct answer:

Explanation:

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

18, 17

$\frac{\begin{array}[b]{r}18\\ -\ 1\end{array}}{ \ \ \space17}$

Report an Error

Example Question #56 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}18\\ -\ 9\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}18\\ -\ 9\end{array}}{ \ \ \ \space 9}$

Report an Error

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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 #71 : Adding And Subtracting Within 20

Example Question #72 : Adding And Subtracting Within 20

Example Question #73 : Adding And Subtracting Within 20

Example Question #74 : Adding And Subtracting Within 20

Example Question #51 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #52 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #53 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #54 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #55 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #56 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

All Common Core: 1st Grade Math Resources

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