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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 #662 : Operations

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

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 #111 : Adding And Subtracting Within 20

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

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 #214 : 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 #215 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

14,13,12,11

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

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Example Question #216 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}11\\ -\ 7\end{array}}{ \ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

11, 10, 9, 8, 7, 6, 5, 4

$\frac{\begin{array}[b]{r}11\\ -\ 7\end{array}}{ \ \ \ \space 4}$

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Example Question #217 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

8,7,6

$\frac{\begin{array}[b]{r}8\\ -\ 2\end{array}}{ \ \ \ \space 6}$

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Example Question #91 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}18\\ -\ 12\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}18\\ -\ 12\end{array}}{ \ \ \ \ \space 6}$

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Example Question #91 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}19\\ -\ 17\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}19\\ -\ 17\end{array}}{ \ \ \ \ \space 2}$

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Example Question #220 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}20\\ -\ 15\end{array}}{ \ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}20\\ -\ 15\end{array}}{ \ \ \ \ \ \space 5}$

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Example Question #91 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

Correct answer:

Explanation:

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

12,11,10

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

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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: 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 #662 : Operations

Example Question #111 : Adding And Subtracting Within 20

Example Question #214 : Operations & Algebraic Thinking

Example Question #215 : Operations & Algebraic Thinking

Example Question #216 : Operations & Algebraic Thinking

Example Question #217 : Operations & Algebraic Thinking

Example Question #91 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #91 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #220 : Operations & Algebraic Thinking

Example Question #91 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

All Common Core: 1st Grade Math Resources

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