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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 #81 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}17\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at 17 and count back .

17, 16, 15, 14, 13, 12, 11

$\frac{\begin{array}[b]{r}17\\ -\ 6\end{array}}{ \ \ \space 11}$

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Example Question #81 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}16\\ -\ 2\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

16, 15, 14

$\frac{\begin{array}[b]{r}16\\ -\ 2\end{array}}{ \ \ \space 14}$

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

$\frac{\begin{array}[b]{r}15\\ -\ 5\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

15, 14, 13, 12, 11, 10

$\frac{\begin{array}[b]{r}15\\ -\ 5\end{array}}{ \ \ \space 10}$

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Example Question #631 : How To Subtract

$\frac{\begin{array}[b]{r}13\\ -\ 3\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

13,12,11,10

$\frac{\begin{array}[b]{r}13\\ -\ 3\end{array}}{ \ \ \space 10}$

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Example Question #181 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}11\\ -\ 5\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

11, 10, 9, 8, 7, 6

$\frac{\begin{array}[b]{r}11\\ -\ 5\end{array}}{ \ \ \ \space 6}$

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Example Question #851 : Numbers And Operations

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

Possible Answers:

Correct answer:

Explanation:

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

9,8,7,6,5

$\frac{\begin{array}[b]{r}9\\ -\ 4\end{array}}{ \ \ \ \space 5}$

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Example Question #81 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}7\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

7,6,5,4,3

$\frac{\begin{array}[b]{r}7\\ -\ 4\end{array}}{ \ \ \ \space 3}$

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Example Question #82 : Adding And Subtracting Within 20

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

Possible Answers:

Correct answer:

Explanation:

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

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

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

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Example Question #83 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}20\\ -\ 9\end{array}}{ \ \ \ \space ?}$

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, 11

$\frac{\begin{array}[b]{r}20\\ -\ 9\end{array}}{ \ \ \space11}$

Report an Error

Example Question #186 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}20\\ -\ 17\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}20\\ -\ 17\end{array}}{ \ \ \ \ \ \space 3}$

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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 #81 : Adding And Subtracting Within 20

Example Question #81 : Adding And Subtracting Within 20

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

Example Question #631 : How To Subtract

Example Question #181 : Operations & Algebraic Thinking

Example Question #851 : Numbers And Operations

Example Question #81 : Adding And Subtracting Within 20

Example Question #82 : Adding And Subtracting Within 20

Example Question #83 : Adding And Subtracting Within 20

Example Question #186 : Common Core Math: Grade 1

All Common Core: 1st Grade Math Resources

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