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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 #271 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

9, 8, 7, 6, 5, 4, 3, 2, 1

$\frac{\begin{array}[b]{r}9\\ -\ 8\end{array}}{ \ \ \ \ \space1 }$

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Example Question #722 : How To Subtract

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

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}8\\ -\ 6\end{array}}{ \ \ \ \space 2}$

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Example Question #721 : How To Subtract

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

Possible Answers:

Correct answer:

Explanation:

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

8, 7, 6, 5, 4, 3, 2, 1, 0

$\frac{\begin{array}[b]{r}8\\ -\ 8\end{array}}{ \ \ \ \space 0}$

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Example Question #151 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

Correct answer:

Explanation:

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

6,5,4

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

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Example Question #281 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}7\\ -\ 6\end{array}}{ \ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}7\\ -\ 6\end{array}}{ \ \ \ \space 1}$

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Example Question #161 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}6\\ -\ 1\end{array}}{ \ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

6,5

$\frac{\begin{array}[b]{r}6\\ -\ 1\end{array}}{ \ \ \ \space 5}$

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Example Question #181 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}10\\ -\ 7\end{array}}{ \ \ \ \space 3}$

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Example Question #162 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

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 #281 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

13, 12, 11, 10, 9

$\frac{\begin{array}[b]{r}13\\ -\ 4\end{array}}{ \ \ \ \space 9}$

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Example Question #161 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}14\\ -\ 2\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

14,13,12

$\frac{\begin{array}[b]{r}14\\ -\ 2\end{array}}{ \ \ \space 12}$

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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 #271 : Operations & Algebraic Thinking

Example Question #722 : How To Subtract

Example Question #721 : How To Subtract

Example Question #151 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #281 : Operations & Algebraic Thinking

Example Question #161 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #181 : Adding And Subtracting Within 20

Example Question #162 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #281 : Operations & Algebraic Thinking

Example Question #161 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

All Common Core: 1st Grade Math Resources

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