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Common Core: 2nd Grade Math : Mentally Add and Subtract Within 20: CCSS.Math.Content.2.OA.B.2

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

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All Common Core: 2nd Grade Math Resources

7 Diagnostic Tests 217 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #221 : Operations & Algebraic Thinking

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

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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Example Question #222 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}15\\ -\ 8\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}15\\ -\ 8\end{array}}{ \ \ \ \space 7}$

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Example Question #223 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}16\\ -\ 12\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}16\\ -\ 12\end{array}}{ \ \ \ \ \ \space 4}$

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Example Question #224 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}17\\ -\ 10\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7

$\frac{\begin{array}[b]{r}17\\ -\ 10\end{array}}{ \ \ \ \ \ \space 7}$

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Example Question #225 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}18\\ -\ 15\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3

$\frac{\begin{array}[b]{r}18\\ -\ 15\end{array}}{ \ \ \ \ \ \space 3}$

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Example Question #226 : Operations & Algebraic Thinking

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

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

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

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Example Question #227 : Operations & Algebraic Thinking

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

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

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

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Example Question #1621 : Numbers And Operations

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

Possible Answers:

Correct answer:

Explanation:

To add we count up. Start at and count up .

1,2

$\frac{\begin{array}[b]{r}1\\ +\ 1\end{array}}{ \ \ \ \space2}$

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Example Question #1622 : Numbers And Operations

$\frac{\begin{array}[b]{r}14\\ +\ 1\end{array}}{ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

To add we count up. Start at and count up .

14,15

$\frac{\begin{array}[b]{r}14\\ +\ 1\end{array}}{ \ \ \space15}$

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Example Question #1624 : Numbers And Operations

$\frac{\begin{array}[b]{r}10\\ +\ 2\end{array}}{ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

To add we count up. Start at and count up .

10,11,12

$\frac{\begin{array}[b]{r}10\\ +\ 2\end{array}}{ \ \ \space12}$

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All Common Core: 2nd Grade Math Resources

7 Diagnostic Tests 217 Practice Tests Question of the Day Flashcards Learn by Concept

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Common Core: 2nd Grade Math : Mentally Add and Subtract Within 20: CCSS.Math.Content.2.OA.B.2

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

All Common Core: 2nd Grade Math Resources

Example Questions

Example Question #221 : Operations & Algebraic Thinking

Example Question #222 : Operations & Algebraic Thinking

Example Question #223 : Operations & Algebraic Thinking

Example Question #224 : Operations & Algebraic Thinking

Example Question #225 : Operations & Algebraic Thinking

Example Question #226 : Operations & Algebraic Thinking

Example Question #227 : Operations & Algebraic Thinking

Example Question #1621 : Numbers And Operations

Example Question #1622 : Numbers And Operations

Example Question #1624 : Numbers And Operations

All Common Core: 2nd Grade Math Resources

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