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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 #2 : Knowing How And When To Subtract

$\frac{\begin{array}[b]{r}3\\ -\ 2\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

3, 2, 1

$\frac{\begin{array}[b]{r}3\\ -\ 2\end{array}}{ \ \ \ \space 1}$

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Example Question #2 : Knowing How And When To Subtract

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

Possible Answers:

Correct answer:

Explanation:

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

2, 1, 0

$\frac{\begin{array}[b]{r}2\\ -\ 2\end{array}}{ \ \ \ \space 0}$

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Example Question #3 : Knowing How And When To Subtract

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

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

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

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Example Question #4 : Knowing How And When To Subtract

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

Possible Answers:

Correct answer:

Explanation:

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

4, 3, 2, 1,

$\frac{\begin{array}[b]{r}4\\ -\ 3\end{array}}{ \ \ \ \space 1}$

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Example Question #5 : Knowing How And When To Subtract

$\frac{\begin{array}[b]{r}20\\ -\ 4\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

20, 19, 18, 17, 16

$\frac{\begin{array}[b]{r}20\\ -\ 4\end{array}}{ \ \ \space 16}$

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Example Question #6 : Knowing How And When To Subtract

$\frac{\begin{array}[b]{r}19\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}19\\ -\ 6\end{array}}{ \ \ \space 13}$

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Example Question #901 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}18\\ -\ 3\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

18, 17, 16, 15

$\frac{\begin{array}[b]{r}18\\ -\ 3\end{array}}{ \ \ \space15}$

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Example Question #902 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

To subtract we can count backwards. Start at and count back 14.

17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3

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

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Example Question #9 : Knowing How And When To Subtract

$\frac{\begin{array}[b]{r}16\\ -\ 6\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

16, 15, 14, 13, 12, 11, 10

$\frac{\begin{array}[b]{r}16\\ -\ 6\end{array}}{ \ \ \space 10}$

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Example Question #901 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}15\\ -\ 11\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}15\\ -\ 11\end{array}}{ \ \ \ \ \ \space 4}$

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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 #2 : Knowing How And When To Subtract

Example Question #2 : Knowing How And When To Subtract

Example Question #3 : Knowing How And When To Subtract

Example Question #4 : Knowing How And When To Subtract

Example Question #5 : Knowing How And When To Subtract

Example Question #6 : Knowing How And When To Subtract

Example Question #901 : Operations & Algebraic Thinking

Example Question #902 : Operations & Algebraic Thinking

Example Question #9 : Knowing How And When To Subtract

Example Question #901 : Operations & Algebraic Thinking

All Common Core: 1st Grade Math Resources

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