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Common Core: 1st Grade Math : Adding and Subtracting Within 20: CCSS.MATH.CONTENT.1.OA.C.6

Study concepts, example questions & explanations for Common Core: 1st Grade Math

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All Common Core: 1st Grade Math Resources

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Example Questions

Example Question #251 : Common Core Math: Grade 1

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

Possible Answers:

Correct answer:

Explanation:

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

12, 11, 10, 9, 8, 7, 6, 5

$\frac{\begin{array}[b]{r}12\\ -\ 7\end{array}}{ \ \ \ \space 5}$

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Example Question #253 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}11\\ -\ 3\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

11,10,9,8

$\frac{\begin{array}[b]{r}11\\ -\ 3\end{array}}{ \ \ \ \space 8}$

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Example Question #131 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

Correct answer:

Explanation:

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

10,9,8

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

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Example Question #255 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

4,3,2,1,0

$\frac{\begin{array}[b]{r}4\\ -\ 4\end{array}}{ \ \ \ \space 0}$

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Example Question #256 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}14\\ -\ 11\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}14\\ -\ 11\end{array}}{ \ \ \ \ \space 3}$

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Example Question #257 : 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 #258 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}19\\ -\ 18\end{array}}{ \ \ \ \space ?}$

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, 4, 3, 2, 1

$\frac{\begin{array}[b]{r}19\\ -\ 18\end{array}}{ \ \ \ \ \ \space 1}$

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Example Question #259 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}17\\ -\ 13\end{array}}{ \ \ \ \space ?}$

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, 6, 5, 4

$\frac{\begin{array}[b]{r}17\\ -\ 13\end{array}}{ \ \ \ \space 4}$

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Example Question #701 : How To Subtract

$\frac{\begin{array}[b]{r}16\\ -\ 15\end{array}}{ \ \ \ \space ?}$

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, 3, 2, 1

$\frac{\begin{array}[b]{r}16\\ -\ 15\end{array}}{ \ \ \ \ \ \space 1}$

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Example Question #711 : Operations

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

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

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

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Common Core: 1st Grade Math : Adding and Subtracting Within 20: CCSS.MATH.CONTENT.1.OA.C.6

Study concepts, example questions & explanations for Common Core: 1st Grade Math

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #251 : Common Core Math: Grade 1

Example Question #253 : Operations & Algebraic Thinking

Example Question #131 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #255 : Operations & Algebraic Thinking

Example Question #256 : Operations & Algebraic Thinking

Example Question #257 : Operations & Algebraic Thinking

Example Question #258 : Operations & Algebraic Thinking

Example Question #259 : Operations & Algebraic Thinking

Example Question #701 : How To Subtract

Example Question #711 : Operations

All Common Core: 1st Grade Math Resources

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