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

$\frac{\begin{array}[b]{r}15\\ -\ 3\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

15, 14, 13, 12

$\frac{\begin{array}[b]{r}15\\ -\ 3\end{array}}{ \ \ \ \space 12}$

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Example Question #821 : Ssat Elementary Level Quantitative (Math)

$\frac{\begin{array}[b]{r}14\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

14, 13, 12, 11, 10

$\frac{\begin{array}[b]{r}14\\ -\ 4\end{array}}{ \ \ \space 10}$

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Example Question #61 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}13\\ -\ 7\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

13, 12, 11, 10, 9, 8, 7, 6

$\frac{\begin{array}[b]{r}13\\ -\ 7\end{array}}{ \ \ \ \space 6}$

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

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

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, 2, 1

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

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Example Question #612 : How To Subtract

$\frac{\begin{array}[b]{r}10\\ -\ 8\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

10, 9, 8, 7, 6, 5, 4, 3, 2

$\frac{\begin{array}[b]{r}10\\ -\ 8\end{array}}{ \ \ \ \space 2}$

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Example Question #161 : Common Core Math: Grade 1

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

Possible Answers:

Correct answer:

Explanation:

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

9, 8, 7, 6

$\frac{\begin{array}[b]{r}9\\ -\ 6\end{array}}{ \ \ \ \space 3}$

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Example Question #614 : How To Subtract

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

Possible Answers:

Correct answer:

Explanation:

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

7,6

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

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Example Question #611 : Operations

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

Possible Answers:

Correct answer:

Explanation:

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

20,19,18,17

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

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Example Question #62 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}20\\ -\ 19\end{array}}{ \ \ \ \space ?}$

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, 2, 1

$\frac{\begin{array}[b]{r}20\\ -\ 19\end{array}}{ \ \ \ \ \ \space 1}$

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Example Question #612 : Operations

$\frac{\begin{array}[b]{r}19\\ -\ 7\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

19, 18, 17, 16, 15, 14, 13, 12

$\frac{\begin{array}[b]{r}19\\ -\ 7\end{array}}{ \ \ \space 12}$

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

Example Question #821 : Ssat Elementary Level Quantitative (Math)

Example Question #61 : Adding And Subtracting Within 20

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

Example Question #612 : How To Subtract

Example Question #161 : Common Core Math: Grade 1

Example Question #614 : How To Subtract

Example Question #611 : Operations

Example Question #62 : Adding And Subtracting Within 20

Example Question #612 : Operations

All Common Core: 1st Grade Math Resources

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