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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 #171 : Adding And Subtracting Within 20

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

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, 5, 4, 3, 2, 1, 0

$\frac{\begin{array}[b]{r}14\\ -\ 14\end{array}}{ \ \ \ \space 0}$

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Example Question #172 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}19\\ -\ 10\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}19\\ -\ 10\end{array}}{ \ \ \ \ \space 9}$

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Example Question #173 : Adding And Subtracting Within 20

$\frac{\begin{array}[b]{r}19\\ -\ 14\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}19\\ -\ 14\end{array}}{ \ \ \ \ \space 5}$

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Example Question #271 : Common Core Math: Grade 1

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

Possible Answers:

Correct answer:

Explanation:

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

15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1

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

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Example Question #272 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}13\\ -\ 1\end{array}}{ \ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

13,12

$\frac{\begin{array}[b]{r}13\\ -\ 1\end{array}}{ \ \ \space 12}$

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Example Question #273 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}12\\ -\ 8\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}12\\ -\ 8\end{array}}{ \ \ \ \ \space 4}$

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Example Question #274 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}12\\ -\ 10\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}12\\ -\ 10\end{array}}{ \ \ \ \ \ \space 2}$

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Example Question #275 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}11\\ -\ 10\end{array}}{ \ \ \ \ \space ?}$

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, 1

$\frac{\begin{array}[b]{r}11\\ -\ 10\end{array}}{ \ \ \ \ \ \space 1}$

Report an Error

Example Question #276 : Common Core Math: Grade 1

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

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, 1, 0

$\frac{\begin{array}[b]{r}11\\ -\ 11\end{array}}{ \ \ \ \ \space 0}$

Report an Error

Example Question #277 : Common Core Math: Grade 1

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

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, 1, 0

$\frac{\begin{array}[b]{r}10\\ -\ 10\end{array}}{ \ \ \ \ \space 0}$

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 #171 : Adding And Subtracting Within 20

Example Question #172 : Adding And Subtracting Within 20

Example Question #173 : Adding And Subtracting Within 20

Example Question #271 : Common Core Math: Grade 1

Example Question #272 : Common Core Math: Grade 1

Example Question #273 : Common Core Math: Grade 1

Example Question #274 : Common Core Math: Grade 1

Example Question #275 : Common Core Math: Grade 1

Example Question #276 : Common Core Math: Grade 1

Example Question #277 : Common Core Math: Grade 1

All Common Core: 1st Grade Math Resources

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