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Common Core: 2nd Grade Math : Number & Operations in Base Ten

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

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All Common Core: 2nd Grade Math Resources

7 Diagnostic Tests 217 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #1071 : Common Core Math: Grade 2

Solve:

$\frac{\begin{array}[b]{r}36\\20\\25\\ +\ 12\end{array}}{\space }$

Possible Answers:

Correct answer:

Explanation:

When we add with multi-digit numbers, we start with the numbers in the ones place, and then move to the left.

9 1

Let's add the digits in the ones place:

6+0+5+2=13

Because the sum is greater than , we have to carry the to the tens place. So far, your work should look like the following:

9 2

Next, we add the numbers in the tens position, including the that was carried over:

9 3

Let's add the digits in the tens place:

1+3+2+2+1=9

Your final answer should be

9 4

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Example Question #1 : Add Up To Four Two Digit Numbers: Ccss.Math.Content.2.Nbt.B.6

Solve:

$\frac{\begin{array}[b]{r}89\\30\\56\\ +\ 11\end{array}}{\space }$

Possible Answers:

184

183

185

186

Correct answer:

186

Explanation:

When we add with multi-digit numbers, we start with the numbers in the ones place, and then move to the left.

10 1

Let's add the digits in the ones place:

9+0+6+1=16

Because the sum is greater than , we have to carry the to the tens place. So far, your work should look like the following:

10 2

Next, we add the numbers in the tens position, including the that was carried over:

10 3

Let's add the digits in the tens place:

1+8+3+5+1=18

Your final answer should be 186

10 4

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Example Question #4 : Add Up To Four Two Digit Numbers: Ccss.Math.Content.2.Nbt.B.6

Solve:

$\frac{\begin{array}[b]{r}97\\13\\98\\ +\ 15\end{array}}{\space }$

Possible Answers:

225

223

224

226

Correct answer:

223

Explanation:

When we add with multi-digit numbers, we start with the numbers in the ones place, and then move to the left.

11 1

Let's add the digits in the ones place:

7+3+8+5=23

Because the sum is greater than , we have to carry the to the tens place. So far, your work should look like the following:

11 2

Next, we add the numbers in the tens position, including the that was carried over:

11 3

Let's add the digits in the tens place:

2+8+1+9+1=22

Your final answer should be 223

11 4

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Example Question #1072 : Common Core Math: Grade 2

Solve:

$\frac{\begin{array}[b]{r}81\\39\\82\\ +\ 91\end{array}}{\space }$

Possible Answers:

293

294

296

295

Correct answer:

293

Explanation:

When we add with multi-digit numbers, we start with the numbers in the ones place, and then move to the left.

12 1

Let's add the digits in the ones place:

1+9+2+1=13

Because the sum is greater than , we have to carry the to the tens place. So far, your work should look like the following:

12 2

Next, we add the numbers in the tens position, including the that was carried over:

12 3

Let's add the digits in the tens place:

1+8+3+8+9=29

Your final answer should be 293

12 4

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Example Question #1071 : Number & Operations In Base Ten

Solve the following:

$\frac{\begin{array}[b]{r}87\\30\\97\\ +\ 64\end{array}}{\space }$

Possible Answers:

278

275

276

277

Correct answer:

278

Explanation:

When we add with multi-digit numbers, we start with the numbers in the ones place, and then move to the left.

1 1

Let's add the digits in the ones place:

7+0+7+4=18

Because the sum is greater than , we have to carry the to the tens place. So far, your work should look like the following:

1 2

Next, we add the numbers in the tens position, including the that was carried over:

1 3

Let's add the digits in the tens place:

1+8+3+9+6=27

Your final answer should be 278

1 4

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Example Question #1072 : Number & Operations In Base Ten

Solve:

+ 14

Possible Answers:

185

184

183

182

Correct answer:

182

Explanation:

When we add with multi-digit numbers, we start with the numbers in the ones place, and then move to the left.

2 1

Let's add the digits in the ones place:

6+4+8+4=22

Because the sum is greater than , we have to carry the to the tens place. So far, your work should look like the following:

2 2

Next, we add the numbers in the tens position, including the that was carried over:

2 3

Let's add the digits in the tens place:

2+4+6+5+1=18

Your final answer should be 182

2 4

Report an Error

Example Question #1 : Add And Subtract Within 1000: Ccss.Math.Content.2.Nbt.B.7

Solve the following:

$\frac{\begin{array}[b]{r}920\\ -\ 290\end{array}}{\space }$

Possible Answers:

630

632

631

634

Correct answer:

630

Explanation:

When we subtract multi-digit numbers, we start with the digits in the ones place and move to the left.

Let's look at the numbers in the ones place:

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

Next, let's look at the numbers in the tens place:

$\frac{\begin{array}[b]{r}2\\ -\ 9\end{array}}{\ \ \ }$

When the top number is smaller than the bottom number, we have to borrow from the number to the left because we can't take away from since is the smaller number. In this case, we are going to look to the . We only ever need to take away from the number to the left. For this problem, that will leave us with a to replace the . So far, your work should look something like this:

$\frac{\begin{array}[b]{r}^{8} \not920\\ -\ 290\end{array}}{\space }$

Remember, we've borrowed from the hundreds place, so we can put a in front of the number in the tens place. So far, your work should look something like this:

$\frac{\begin{array}[b]{r}^{8} \not9\ ^{12}\not2\ \ \ \ \ 0\\ -\ 2 \ \ \ \ \ 9\ \ \ \ \ 0\end{array}}{\space }$

Now, we can subtract the numbers in the tens place:

$\frac{\begin{array}[b]{r}12\\ -\ 9\end{array}}{\ \ \ 3}$

Next, we can subtract the numbers in the hundreds place:

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

Your final answer should be 630

$\frac{\begin{array}[b]{r}^{8} \not9\ ^{12}\not2\ \ \ \ \ 0\\ -\ 2 \ \ \ \ \ 9\ \ \ \ \ 0\end{array}}{\ \ \ 6 \ \ \ \ \ 3\ \ \ \ \ 0}$

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Example Question #1071 : Number & Operations In Base Ten

Solve the following:

$\frac{\begin{array}[b]{r}169\\ +\ 323\end{array}}{\space }$

Possible Answers:

493

494

492

495

Correct answer:

492

Explanation:

When we add with multi-digit numbers, we start with the numbers in the ones place, and then move to the left to the tens place, followed by the hundreds place.

Add the numbers in the ones place:

9+3=12

Because this sum is greater than , we write the from the ones place and carry the from the tens place over to the left. Your work should look something like this:

$\frac{\begin{array}[b]{r}1^{{\color{Red} 1}}6\ 9\\ +\ 3\ 2\ 3\end{array}}{\ \ \ \ \ \ \ \ 2 }$

Add the numbers in the tens place, including the that was carried over:

1+6+2=9

Add the numbers in the hundreds place:

1+3=4

Your final answer should be 492:

$\frac{\begin{array}[b]{r}169\\ +\ 323\end{array}}{\ \ \ 492 }$

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Example Question #1605 : How To Add

Solve the following:

$\frac{\begin{array}[b]{r}432\\ +\ 100\end{array}}{ }$

Possible Answers:

442

332

500

532

300

Correct answer:

532

Explanation:

When adding any number by 100 the only number that will change in your answer is the hundreds place.

2+0=2

3+0=3

4+1=5

$\frac{\begin{array}[b]{r}432\\ +\ 100\end{array}}{\ \ \ \space 532}$

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Example Question #973 : Operations

$\frac{\begin{array}[b]{r}349\\ +\ 100\end{array}}{?}$

Possible Answers:

249

400

449

200

359

Correct answer:

449

Explanation:

When adding any number by 100 the only number that will change in your answer is the hundreds place.

9+0=9

4+0=4

3+1=4

$\frac{\begin{array}[b]{r}349\\ +\ 100\end{array}}{\ \ \ \space449}$

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Common Core: 2nd Grade Math : Number & Operations in Base Ten

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

All Common Core: 2nd Grade Math Resources

Example Questions

Example Question #1071 : Common Core Math: Grade 2

Example Question #1 : Add Up To Four Two Digit Numbers: Ccss.Math.Content.2.Nbt.B.6

Example Question #4 : Add Up To Four Two Digit Numbers: Ccss.Math.Content.2.Nbt.B.6

Example Question #1072 : Common Core Math: Grade 2

Example Question #1071 : Number & Operations In Base Ten

Example Question #1072 : Number & Operations In Base Ten

Example Question #1 : Add And Subtract Within 1000: Ccss.Math.Content.2.Nbt.B.7

Example Question #1071 : Number & Operations In Base Ten

Example Question #1605 : How To Add

Example Question #973 : Operations

All Common Core: 2nd Grade Math Resources

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