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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 #187 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}19\\ -\ 15\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}19\\ -\ 15\end{array}}{ \ \ \ \ \ \space 4}$

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Example Question #188 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}18\\ -\ 11\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}18\\ -\ 11\end{array}}{ \ \ \ \ \ \space 7}$

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Example Question #189 : Common Core Math: Grade 1

$\frac{\begin{array}[b]{r}17\\ -\ 8\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}17\\ -\ 8\end{array}}{ \ \ \ \space 9}$

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Example Question #61 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

Correct answer:

Explanation:

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

16,15

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

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Example Question #71 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

$\frac{\begin{array}[b]{r}15\\ -\ 12\end{array}}{ \ \ \ \space ?}$

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

$\frac{\begin{array}[b]{r}15\\ -\ 12\end{array}}{ \ \ \ \ \ \space 3}$

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Example Question #71 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

Correct answer:

Explanation:

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

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

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

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Example Question #191 : Common Core Math: Grade 1

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

Possible Answers:

Correct answer:

Explanation:

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

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

$\frac{\begin{array}[b]{r}10\\ -\ 6\end{array}}{ \ \ \ \space 4}$

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Example Question #72 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

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

Possible Answers:

Correct answer:

Explanation:

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

1,0

$\frac{\begin{array}[b]{r}1\\ -\ 1\end{array}}{ \ \ \ \space 0}$

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Example Question #195 : Operations & Algebraic Thinking

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

Possible Answers:

Correct answer:

Explanation:

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

3,2

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

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Example Question #196 : Operations & Algebraic Thinking

$\frac{\begin{array}[b]{r}6\\ -\ 3\end{array}}{ \ \ \ \space ?}$

Possible Answers:

Correct answer:

Explanation:

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

6,5,4,3

$\frac{\begin{array}[b]{r}6\\ -\ 3\end{array}}{ \ \ \ \space 3}$

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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 #187 : Common Core Math: Grade 1

Example Question #188 : Common Core Math: Grade 1

Example Question #189 : Common Core Math: Grade 1

Example Question #61 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #71 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #71 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #191 : Common Core Math: Grade 1

Example Question #72 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

Example Question #195 : Operations & Algebraic Thinking

Example Question #196 : Operations & Algebraic Thinking

All Common Core: 1st Grade Math Resources

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