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Common Core: 1st Grade Math : Place Value and Properties of Operations to Add and Subtract

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 #271 : Number & Operations In Base Ten

Add:

$\frac{\begin{array}[b]{r}36\\ +\ 11\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

When we add two digit numbers, we start by adding the numbers in the ones place.

$\frac{\begin{array}[b]{r}3{\color{Red} 6}\\ +\ 1{\color{Red} 1}\end{array}}{ \ \ \ \ \ \space7}$

Next, we need to add the numbers in the tens place.

$\frac{\begin{array}[b]{r}{\color{Red} 3}6\\ +\ {\color{Red} 1}1\end{array}}{ \ \ \ \space47}$

The final answer is

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Example Question #12 : Add A Two Digit Number To A One Digit Number, And Two Digit Number And A Multiple Of 10: Ccss.Math.Content.1.Nbt.C.4

Solve the following:

$\frac{\begin{array}[b]{r}18\\ +\ 51\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

When we add two digit numbers, we start by adding the numbers in the ones place.

$\frac{\begin{array}[b]{r}1{\color{Red} 8}\\ +\ 5{\color{Red} 1}\end{array}}{ \ \ \ \ \ \space9}$

Next, we need to add the numbers in the tens place.

$\frac{\begin{array}[b]{r}{\color{Red} 1}8\\ +\ {\color{Red} 5}1\end{array}}{ \ \ \ \space69}$

The final answer is

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

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

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.

1+1=2

$\frac{\begin{array}[b]{r}15\\ +\ 10\end{array}}{ \ \ \ \ \space25}$

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Example Question #11 : Place Value And Properties Of Operations To Add And Subtract

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

Possible Answers:

Correct answer:

Explanation:

1+1=2

$\frac{\begin{array}[b]{r}10\\ +\ 10\end{array}}{ \ \ \ \space20}$

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Example Question #12 : Place Value And Properties Of Operations To Add And Subtract

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

Possible Answers:

Correct answer:

Explanation:

2+1=3

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

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Example Question #13 : Place Value And Properties Of Operations To Add And Subtract

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

Possible Answers:

Correct answer:

Explanation:

2+1=3

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

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Example Question #3 : 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

$\frac{\begin{array}[b]{r}20\\ +\ 10\end{array}}{ \ \ \ \space40}$

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Example Question #2151 : Operations

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

Possible Answers:

Correct answer:

Explanation:

3+1=4

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

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Example Question #4 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

$\frac{\begin{array}[b]{r}40\\ +\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

4+1=5

$\frac{\begin{array}[b]{r}40\\ +\ 10\end{array}}{ \ \ \ \space50}$

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

$\frac{\begin{array}[b]{r}45\\ +\ 10\end{array}}{ \ \ \space}$

Possible Answers:

Correct answer:

Explanation:

4+1=5

$\frac{\begin{array}[b]{r}45\\ +\ 10\end{array}}{ \ \ \ \space55}$

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All Common Core: 1st Grade Math Resources

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Common Core: 1st Grade Math : Place Value and Properties of Operations to Add and Subtract

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

All Common Core: 1st Grade Math Resources

Example Questions

Example Question #271 : Number & Operations In Base Ten

Example Question #12 : Add A Two Digit Number To A One Digit Number, And Two Digit Number And A Multiple Of 10: Ccss.Math.Content.1.Nbt.C.4

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

Example Question #11 : Place Value And Properties Of Operations To Add And Subtract

Example Question #12 : Place Value And Properties Of Operations To Add And Subtract

Example Question #13 : Place Value And Properties Of Operations To Add And Subtract

Example Question #3 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

Example Question #2151 : Operations

Example Question #4 : Add And Subtract 10 To Two Digit Numbers: Ccss.Math.Content.1.Nbt.C.5

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

All Common Core: 1st Grade Math Resources

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