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Common Core: 1st Grade Math : Add and Subtract 10 to Two-Digit Numbers: CCSS.MATH.CONTENT.1.NBT.C.5

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 #21 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

$\frac{\begin{array}[b]{r}20\\ +\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

When we add to a two digit number, the only number that changes in our answer is the tens position, and it will always go up by . Mentally, we can add to the number in the tens place to find our answer.

2+1=3

$\frac{\begin{array}[b]{r}20\\ +\ 10\end{array}}{ \ \ \ \space30}$

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Example Question #22 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

$\frac{\begin{array}[b]{r}25\\ +\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

2+1=3

$\frac{\begin{array}[b]{r}25\\ +\ 10\end{array}}{ \ \ \ \space35}$

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Example Question #23 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

$\frac{\begin{array}[b]{r}30\\ +\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

3+1=4

$\frac{\begin{array}[b]{r}30\\ +\ 10\end{array}}{ \ \ \ \space40}$

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Example Question #21 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

$\frac{\begin{array}[b]{r}35\\ +\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

3+1=4

$\frac{\begin{array}[b]{r}35\\ +\ 10\end{array}}{ \ \ \ \space45}$

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Example Question #22 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

$\frac{\begin{array}[b]{r}95\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

When we subtract from a two digit number, the only number that changes in our answer is the tens position, and it will always go down by . Mentally, we can subtract from the number in the tens place to find our answer.

9-1=8

$\frac{\begin{array}[b]{r}95\\ -\ 10\end{array}}{ \ \ \ \ \space85}$

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Example Question #746 : How To Subtract

$\frac{\begin{array}[b]{r}90\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

9-1=8

$\frac{\begin{array}[b]{r}90\\ -\ 10\end{array}}{ \ \ \ \ \space80}$

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Example Question #23 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

$\frac{\begin{array}[b]{r}85\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

8-1=7

$\frac{\begin{array}[b]{r}85\\ -\ 10\end{array}}{ \ \ \ \ \space75}$

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Example Question #748 : How To Subtract

$\frac{\begin{array}[b]{r}80\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

8-1=7

$\frac{\begin{array}[b]{r}80\\ -\ 10\end{array}}{ \ \ \ \ \space70}$

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Example Question #301 : Number & Operations In Base Ten

$\frac{\begin{array}[b]{r}75\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

7-1=6

$\frac{\begin{array}[b]{r}75\\ -\ 10\end{array}}{ \ \ \ \ \space65}$

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Example Question #752 : How To Subtract

$\frac{\begin{array}[b]{r}70\\ -\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

7-1=6

$\frac{\begin{array}[b]{r}70\\ -\ 10\end{array}}{ \ \ \ \ \space60}$

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All Common Core: 1st Grade Math Resources

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Common Core: 1st Grade Math : Add and Subtract 10 to Two-Digit Numbers: CCSS.MATH.CONTENT.1.NBT.C.5

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

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #21 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

Example Question #22 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

Example Question #23 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

Example Question #21 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

Example Question #22 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

Example Question #746 : How To Subtract

Example Question #23 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

Example Question #748 : How To Subtract

Example Question #301 : Number & Operations In Base Ten

Example Question #752 : How To Subtract

All Common Core: 1st Grade Math Resources

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