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

$\frac{\begin{array}[b]{r}15\\ -\ 1\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

15,14

$\frac{\begin{array}[b]{r}15\\ -\ 1\end{array}}{ \ \ \space 14}$

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Example Question #111 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}14\\ -\ 8\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}14\\ -\ 8\end{array}}{ \ \ \ \space 6}$

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Example Question #142 : Adding And Subtracting Within 20

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

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, 3, 2, 1, 0

$\frac{\begin{array}[b]{r}13\\ -\ 13\end{array}}{ \ \ \ \ \ \space 0}$

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Example Question #904 : Ssat Elementary Level Quantitative (Math)

$\frac{\begin{array}[b]{r}12\\ -\ 9\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

12, 11, 10, 9, 8, 7, 6, 5, 4, 3

$\frac{\begin{array}[b]{r}12\\ -\ 9\end{array}}{ \ \ \ \space 3}$

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Example Question #121 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

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, 2

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

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Example Question #243 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

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

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

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Example Question #141 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

6, 5, 4, 3, 2

$\frac{\begin{array}[b]{r}6\\ -\ 4\end{array}}{ \ \ \ \space 2}$

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Example Question #142 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

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

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

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Example Question #246 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}19\\ -\ 8\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}19\\ -\ 8\end{array}}{ \ \ \space 11}$

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Example Question #121 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

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, 0

$\frac{\begin{array}[b]{r}18\\ -\ 18\end{array}}{ \ \ \ \ \ \space 0}$

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

Example Question #111 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #142 : Adding And Subtracting Within 20

Example Question #904 : Ssat Elementary Level Quantitative (Math)

Example Question #121 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #243 : Operations & Algebraic Thinking

Example Question #141 : Adding And Subtracting Within 20

Example Question #142 : Adding And Subtracting Within 20

Example Question #246 : Operations & Algebraic Thinking

Example Question #121 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

All Common Core: 1st Grade Math Resources

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