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

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All Common Core: 2nd Grade Math Resources

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Example Questions

Example Question #1 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}20\\ -\ 1\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

20,19

$\frac{\begin{array}[b]{r}20\\ -\ 1\end{array}}{ \ \ \space19}$

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Example Question #1 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

Correct answer:

Explanation:

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

19,18,17

$\frac{\begin{array}[b]{r}19\\ -\ 2\end{array}}{ \ \ \space17}$

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Example Question #3 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Solve the following:

$\frac{\begin{array}[b]{r}16\\ -\ 14\end{array}}{ \ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

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

16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2

$\frac{\begin{array}[b]{r}16\\ -\ 14\end{array}}{ \ \ \ \ \ \space2}$

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Example Question #1 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

Correct answer:

Explanation:

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

13, 12, 11, 10, 9, 8, 7

$\frac{\begin{array}[b]{r}13\\ -\ 6\end{array}}{ \ \ \ \space7}$

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Example Question #5 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}9\\ -\ 3\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

9, 8, 7, 6

$\frac{\begin{array}[b]{r}9\\ -\ 3\end{array}}{ \ \ \ \space6}$

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Example Question #2 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

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

Possible Answers:

Correct answer:

Explanation:

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

7, 6, 5, 4, 3, 2, 1, 0

$\frac{\begin{array}[b]{r}7\\ -\ 7\end{array}}{ \ \ \ \space0}$

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Example Question #7 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}6\\ -\ 5\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

6, 5, 4, 3, 2, 1

$\frac{\begin{array}[b]{r}6\\ -\ 5\end{array}}{ \ \ \ \space1}$

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Example Question #1 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}5\\ -\ 3\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

5, 4, 3, 2

$\frac{\begin{array}[b]{r}5\\ -\ 3\end{array}}{ \ \ \ \space2}$

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Example Question #322 : Ssat Elementary Level Quantitative (Math)

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

Possible Answers:

Correct answer:

Explanation:

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

4, 3

$\frac{\begin{array}[b]{r}4\\ -\ 1\end{array}}{ \ \ \ \space3}$

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Example Question #2 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

$\frac{\begin{array}[b]{r}7\\ -\ 2\end{array}}{ \ \ \ \space?}$

Possible Answers:

Correct answer:

Explanation:

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

7, 6, 5

$\frac{\begin{array}[b]{r}7\\ -\ 2\end{array}}{ \ \ \ \space5}$

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All Common Core: 2nd Grade Math Resources

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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 #1 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #1 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #3 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #1 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #5 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #2 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #7 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #1 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Example Question #322 : Ssat Elementary Level Quantitative (Math)

Example Question #2 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

All Common Core: 2nd Grade Math Resources

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