Common Core: 2nd Grade Math : Add up to Four Two-Digit Numbers: CCSS.Math.Content.2.NBT.B.6

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

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Example Questions

Example Question #1061 : Number & Operations In Base Ten

Solve:

\displaystyle \frac{\begin{array}[b]{r}18\\48\\68\\ +\ 22\end{array}}{\space }

Possible Answers:

\displaystyle 157

\displaystyle 158

\displaystyle 156

\displaystyle 155

Correct answer:

\displaystyle 156

Explanation:

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

3 1

Let's add the digits in the ones place:

\displaystyle 8+8+8+2=26

Because the sum is greater than \displaystyle 9, we have to carry the \displaystyle 2 to the tens place. So far, your work should look like the following: 

3 3

Next, we add the numbers in the tens position, including the \displaystyle 2 that was carried over:

3 5

Let's add the digits in the tens place:

\displaystyle 2+1+4+6+2=15

Your final answer should be \displaystyle 156

3 4

Example Question #1062 : Number & Operations In Base Ten

Solve:

\displaystyle \frac{\begin{array}[b]{r}43\\36\\11\\ +\ 56\end{array}}{\space }

Possible Answers:

\displaystyle 145

\displaystyle 146

\displaystyle 144

\displaystyle 147

Correct answer:

\displaystyle 146

Explanation:

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

4 1

Let's add the digits in the ones place:

\displaystyle 3+6+1+6=16

Because the sum is greater than \displaystyle 9, we have to carry the \displaystyle 1 to the tens place. So far, your work should look like the following: 

4 2

Next, we add the numbers in the tens position, including the \displaystyle 1 that was carried over:

4 3

Let's add the digits in the tens place:

\displaystyle 1+4+3+1+5=14

Your final answer should be \displaystyle 146

4 4

Example Question #1063 : Number & Operations In Base Ten

Solve:

\displaystyle \frac{\begin{array}[b]{r}80\\99\\42\\ +\ 82\end{array}}{\space }

Possible Answers:

\displaystyle 300

\displaystyle 301

\displaystyle 302

\displaystyle 303

Correct answer:

\displaystyle 303

Explanation:

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

7 1

Let's add the digits in the ones place:

\displaystyle 0+9+2+2=13

Because the sum is greater than \displaystyle 9, we have to carry the \displaystyle 1 to the tens place. So far, your work should look like the following: 

7 2

Next, we add the numbers in the tens position, including the \displaystyle 1 that was carried over:

7 3

Let's add the digits in the tens place:

\displaystyle 1+8+9+4+8=30

Your final answer should be \displaystyle 303

7 4

Example Question #1064 : Number & Operations In Base Ten

Solve:

\displaystyle \frac{\begin{array}[b]{r}48\\21\\17\\ +\ 46\end{array}}{\space }

Possible Answers:

\displaystyle 133

\displaystyle 131

\displaystyle 134

\displaystyle 132

Correct answer:

\displaystyle 132

Explanation:

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

8 1

Let's add the digits in the ones place:

\displaystyle 8+1+7+6=22

Because the sum is greater than \displaystyle 9, we have to carry the \displaystyle 2 to the tens place. So far, your work should look like the following: 

8 2

Next, we add the numbers in the tens position, including the \displaystyle 2 that was carried over:

8 3

Let's add the digits in the tens place:

\displaystyle 2+4+2+1+4=13

Your final answer should be \displaystyle 132

8 4

Example Question #1065 : Number & Operations In Base Ten

Solve:

\displaystyle \frac{\begin{array}[b]{r}53\\11\\66\\ +\ 47\end{array}}{\space }

Possible Answers:

\displaystyle 177

\displaystyle 176

\displaystyle 175

\displaystyle 174

Correct answer:

\displaystyle 177

Explanation:

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

5 1

Let's add the digits in the ones place:

\displaystyle 3+1+6+7=17

Because the sum is greater than \displaystyle 9, we have to carry the \displaystyle 1 to the tens place. So far, your work should look like the following: 

5 2

Next, we add the numbers in the tens position, including the \displaystyle 1 that was carried over:

5 3

Let's add the digits in the tens place:

\displaystyle 1+5+1+6+4=17

Your final answer should be \displaystyle 177

5 4

Example Question #1066 : Number & Operations In Base Ten

Solve:

\displaystyle \frac{\begin{array}[b]{r}87\\81\\90\\ +\ 86\end{array}}{\space }

Possible Answers:

\displaystyle 344

\displaystyle 337

\displaystyle 336

\displaystyle 335

Correct answer:

\displaystyle 344

Explanation:

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

6 1

Let's add the digits in the ones place:

\displaystyle 7+1+0+6=14

Because the sum is greater than \displaystyle 9, we have to carry the \displaystyle 1 to the tens place. So far, your work should look like the following: 

6 2

Next, we add the numbers in the tens position, including the \displaystyle 1 that was carried over:

6 3

Let's add the digits in the tens place:

\displaystyle 1+8+8+9+8=34

Your final answer should be \displaystyle 344

6 4

Example Question #1071 : Number & Operations In Base Ten

Solve:

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

 

Possible Answers:

\displaystyle 93

\displaystyle 91

\displaystyle 94

\displaystyle 92

Correct answer:

\displaystyle 93

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:

\displaystyle 6+0+5+2=13

Because the sum is greater than \displaystyle 9, we have to carry the \displaystyle 1 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 \displaystyle 1 that was carried over:

9 3

Let's add the digits in the tens place:

\displaystyle 1+3+2+2+1=9

Your final answer should be \displaystyle 93

9 4

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

Solve:

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

Possible Answers:

\displaystyle 183

\displaystyle 185

\displaystyle 186

\displaystyle 184

Correct answer:

\displaystyle 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:

\displaystyle 9+0+6+1=16

Because the sum is greater than \displaystyle 9, we have to carry the \displaystyle 1 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 \displaystyle 1 that was carried over:

10 3

Let's add the digits in the tens place:

\displaystyle 1+8+3+5+1=18

Your final answer should be \displaystyle 186


10 4

Example Question #1072 : Number & Operations In Base Ten

Solve:

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

Possible Answers:

\displaystyle 224

\displaystyle 223

\displaystyle 225

\displaystyle 226

Correct answer:

\displaystyle 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:

\displaystyle 7+3+8+5=23

Because the sum is greater than \displaystyle 9, we have to carry the \displaystyle 2 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 \displaystyle 2 that was carried over:

11 3

Let's add the digits in the tens place:

\displaystyle 2+8+1+9+1=22

Your final answer should be \displaystyle 223

11 4

Example Question #1073 : Number & Operations In Base Ten

Solve:

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

Possible Answers:

\displaystyle 295

\displaystyle 294

\displaystyle 296

\displaystyle 293

Correct answer:

\displaystyle 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:

\displaystyle 1+9+2+1=13

Because the sum is greater than \displaystyle 9, we have to carry the \displaystyle 1 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 \displaystyle 1 that was carried over:

12 3

Let's add the digits in the tens place:

\displaystyle 1+8+3+8+9=29

Your final answer should be \displaystyle 293

12 4

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