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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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Example Questions

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Example Question #17 :Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start atand 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 #18 :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 atand count back.

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

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

Report an Error

Example Question #19 :Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start atand count back.

16, 15, 14, 13, 12, 11

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

Report an Error

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

$\frac{\begin{array}[b]{r}15\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start atand count back.

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

$\frac{\begin{array}[b]{r}15\\ -\ 6\end{array}}{ \ \ \ \space 9}$

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Example Question #801 :Ssat Elementary Level Quantitative (Math)

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start atand 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 #41 :Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start atand 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 #42 :Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start atand count back.

12, 11

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

Report an Error

Example Question #43 :Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start atand 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 #44 :Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start atand count back.

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

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

Report an Error

Example Question #45 :Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start atand count back.

10, 9, 8, 7, 6

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

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

Example Question #18 :Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #19 :Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Example Question #801 :Ssat Elementary Level Quantitative (Math)

Example Question #41 :Adding And Subtracting Within 20

Example Question #42 :Adding And Subtracting Within 20

Example Question #43 :Adding And Subtracting Within 20

Example Question #44 :Adding And Subtracting Within 20

Example Question #45 :Adding And Subtracting Within 20

All Common Core: 1st Grade Math Resources

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