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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 #592 : Operations

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

Possible Answers:

Correct answer:

Explanation:

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

9,8,7

$\frac{\begin{array}[b]{r}9\\ -\ 2\end{array}}{ \ \ \ \space 7}$

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Example Question #142 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

8,7,6,5,4

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

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Example Question #22 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}20\\ -\ 2\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

20, 19, 18

$\frac{\begin{array}[b]{r}20\\ -\ 2\end{array}}{ \ \ \space 18}$

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Example Question #51 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}20\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}20\\ -\ 6\end{array}}{ \ \ \space 14}$

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Example Question #51 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}19\\ -\ 1\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

19, 18

$\frac{\begin{array}[b]{r}19\\ -\ 1\end{array}}{ \ \ \space 18}$

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Example Question #31 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}19\\ -\ 16\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}19\\ -\ 16\end{array}}{ \ \ \ \ \ \space 3}$

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Example Question #52 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}18\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}18\\ -\ 6\end{array}}{ \ \ \ \space 12}$

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Example Question #153 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}18\\ -\ 13\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}18\\ -\ 13\end{array}}{ \ \ \ \ \ \space 5}$

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Example Question #53 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}17\\ -\ 3\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

17,16,15,14

$\frac{\begin{array}[b]{r}17\\ -\ 3\end{array}}{ \ \ \space 14}$

Report an Error

Example Question #54 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}16\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

16, 15, 14, 13, 12

$\frac{\begin{array}[b]{r}16\\ -\ 4\end{array}}{ \ \ \space 12}$

Report an Error

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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 #592 : Operations

Example Question #142 : Operations & Algebraic Thinking

Example Question #22 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #51 : Adding And Subtracting Within 20

Example Question #51 : Adding And Subtracting Within 20

Example Question #31 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #52 : Adding And Subtracting Within 20

Example Question #153 : Operations & Algebraic Thinking

Example Question #53 : Adding And Subtracting Within 20

Example Question #54 : Adding And Subtracting Within 20

All Common Core: 1st Grade Math Resources

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