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Common Core: 2nd Grade Math : Add and Subtract Within 100: CCSS.Math.Content.2.NBT.B.5

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

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All Common Core: 2nd Grade Math Resources

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Example Questions

Example Question #1 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}47\\ +\ 15\end{array}}{\space }$ $\displaystyle \frac{\begin{array}[b]{r}47\\ +\ 15\end{array}}{\space }$

Possible Answers:

$\displaystyle 62$

$\displaystyle 64$

$\displaystyle 65$

$\displaystyle 63$

Correct answer:

$\displaystyle 62$

Explanation:

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

Let's add the digits in the ones place:

7+5=12 $\displaystyle 7+5=12$

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:

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

Let's add the digits in the tens place:

1+4+1=6 $\displaystyle 1+4+1=6$

Your final answer should be $\displaystyle 62$

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Example Question #2 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}31\\ +\ 95\end{array}}{\space }$ $\displaystyle \frac{\begin{array}[b]{r}31\\ +\ 95\end{array}}{\space }$

Possible Answers:

124 $\displaystyle 124$

125 $\displaystyle 125$

126 $\displaystyle 126$

123 $\displaystyle 123$

Correct answer:

126 $\displaystyle 126$

Explanation:

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

Let's add the digits in the ones place:

1+5=6 $\displaystyle 1+5=6$

Next, we add the numbers in the tens position.

Let's add the digits in the tens place:

3+9=12 $\displaystyle 3+9=12$

Your final answer should be 126 $\displaystyle 126$

Report an Error

Example Question #3 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}42\\ +\ 57\end{array}}{\space }$ $\displaystyle \frac{\begin{array}[b]{r}42\\ +\ 57\end{array}}{\space }$

Possible Answers:

$\displaystyle 97$

100 $\displaystyle 100$

$\displaystyle 98$

$\displaystyle 99$

Correct answer:

$\displaystyle 99$

Explanation:

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

Let's add the digits in the ones place:

2+7=9 $\displaystyle 2+7=9$

Next, we add the numbers in the tens position.

Let's add the digits in the tens place:

4+5=9 $\displaystyle 4+5=9$

Your final answer should be $\displaystyle 99$

Report an Error

Example Question #4 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}77\\ +\ 15\end{array}}{\space }$ $\displaystyle \frac{\begin{array}[b]{r}77\\ +\ 15\end{array}}{\space }$

Possible Answers:

$\displaystyle 94$

$\displaystyle 92$

$\displaystyle 93$

$\displaystyle 91$

Correct answer:

$\displaystyle 92$

Explanation:

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

Let's add the digits in the ones place:

7+5=12 $\displaystyle 7+5=12$

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:

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

Let's add the digits in the tens place:

1+7+1=9 $\displaystyle 1+7+1=9$

Your final answer should be $\displaystyle 92$

Report an Error

Example Question #5 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}81\\ +\ 58\end{array}}{\space }$ $\displaystyle \frac{\begin{array}[b]{r}81\\ +\ 58\end{array}}{\space }$

Possible Answers:

136 $\displaystyle 136$

138 $\displaystyle 138$

137 $\displaystyle 137$

139 $\displaystyle 139$

Correct answer:

139 $\displaystyle 139$

Explanation:

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

Let's add the digits in the ones place:

1+8=9 $\displaystyle 1+8=9$

Next, we add the numbers in the tens position.

Let's add the digits in the tens place:

8+5=13 $\displaystyle 8+5=13$

Your final answer should be 139 $\displaystyle 139$

Report an Error

Example Question #6 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}58\\ +\ 19\end{array}}{\space }$ $\displaystyle \frac{\begin{array}[b]{r}58\\ +\ 19\end{array}}{\space }$

Possible Answers:

$\displaystyle 75$

$\displaystyle 78$

$\displaystyle 77$

$\displaystyle 76$

Correct answer:

$\displaystyle 77$

Explanation:

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

Let's add the digits in the ones place:

8+9=17 $\displaystyle 8+9=17$

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:

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

Let's add the digits in the tens place:

1+5+1=7 $\displaystyle 1+5+1=7$

Your final answer should be $\displaystyle 77$

Report an Error

Example Question #7 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}59\\ +\ 39\end{array}}{\space }$ $\displaystyle \frac{\begin{array}[b]{r}59\\ +\ 39\end{array}}{\space }$

Possible Answers:

100 $\displaystyle 100$

$\displaystyle 99$

$\displaystyle 98$

$\displaystyle 97$

Correct answer:

$\displaystyle 98$

Explanation:

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

Let's add the digits in the ones place:

9+9=18 $\displaystyle 9+9=18$

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:

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

Let's add the digits in the tens place:

1+5+3=9 $\displaystyle 1+5+3=9$

Your final answer should be $\displaystyle 98$

Report an Error

Example Question #8 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}38\\ +\ 43\end{array}}{\space }$ $\displaystyle \frac{\begin{array}[b]{r}38\\ +\ 43\end{array}}{\space }$

Possible Answers:

$\displaystyle 82$

$\displaystyle 81$

$\displaystyle 83$

$\displaystyle 80$

Correct answer:

$\displaystyle 81$

Explanation:

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

Let's add the digits in the ones place:

8+3=11 $\displaystyle 8+3=11$

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:

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

Let's add the digits in the tens place:

1+3+4=8 $\displaystyle 1+3+4=8$

Your final answer should be $\displaystyle 81$

Report an Error

Example Question #9 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}48\\ +\ 31\end{array}}{\space }$ $\displaystyle \frac{\begin{array}[b]{r}48\\ +\ 31\end{array}}{\space }$

Possible Answers:

$\displaystyle 77$

$\displaystyle 80$

$\displaystyle 79$

$\displaystyle 78$

Correct answer:

$\displaystyle 79$

Explanation:

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

Let's add the digits in the ones place:

8+1=9 $\displaystyle 8+1=9$

Next, we add the numbers in the tens position.

Let's add the digits in the tens place:

4+3=7 $\displaystyle 4+3=7$

Your final answer should be $\displaystyle 79$

Report an Error

Example Question #10 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}28\\ +\ 63\end{array}}{\space }$ $\displaystyle \frac{\begin{array}[b]{r}28\\ +\ 63\end{array}}{\space }$

Possible Answers:

$\displaystyle 90$

$\displaystyle 93$

$\displaystyle 92$

$\displaystyle 91$

Correct answer:

$\displaystyle 91$

Explanation:

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

Let's add the digits in the ones place:

8+3=11 $\displaystyle 8+3=11$

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:

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

Let's add the digits in the tens place:

1+2+6=9 $\displaystyle 1+2+6=9$

Your final answer should be $\displaystyle 91$

Report an Error

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All Common Core: 2nd Grade Math Resources

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Common Core: 2nd Grade Math : Add and Subtract Within 100: CCSS.Math.Content.2.NBT.B.5

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

All Common Core: 2nd Grade Math Resources

Example Questions

Example Question #1 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #2 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #3 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #4 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #5 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #6 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #7 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #8 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #9 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #10 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

All Common Core: 2nd Grade Math Resources

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