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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

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

Example Questions

Example Question #41 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}36\\ -\ 18\end{array}}{\space }$

Possible Answers:

Correct answer:

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:

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

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:

$\frac{\begin{array}[b]{r}^{2} \not36\\ -\ 18\end{array}}{\space }$

Remember, we've borrowed from the tens place, and one ten is equal to . We now add that to the digit in the ones place, 6+10=16 . Your work should look something like this:

$\frac{\begin{array}[b]{r}^{2} \not3\ ^{16}\not6\\ -\ 1 \ \ \ \ \ 8\end{array}}{\space }$

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

$\frac{\begin{array}[b]{r}16\\ -\ 8\end{array}}{\ \ \ 8}$

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

$\frac{\begin{array}[b]{r}2\\ -\ 1\end{array}}{\ \ \ 1}$

Your final answer should be

$\frac{\begin{array}[b]{r}^{2} \not3\ ^{16}\not6\\ -\ 1 \ \ \ \ \ 8\end{array}}{\ \ \ 1\ \ \ \ \ 8}$

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Example Question #1051 : Number & Operations In Base Ten

Solve:

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

Possible Answers:

Correct answer:

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:

$\frac{\begin{array}[b]{r}1{\color{Red} 5}\\ -\ 1{\color{Red} 0}\end{array}}{\ \ \ \ \ {\color{Red} 5} }$

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

$\frac{\begin{array}[b]{r}{\color{Red} 1}5\\ -\ {\color{Red} 1}0\end{array}}{\ \ \ \ {\color{Red} 0}5}$

Your final answer should be

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Example Question #1052 : Number & Operations In Base Ten

Solve:

$\frac{\begin{array}[b]{r}37\\ -\ 11\end{array}}{\space }$

Possible Answers:

Correct answer:

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:

$\frac{\begin{array}[b]{r}3{\color{Red} 7}\\ -\ 1{\color{Red} 1}\end{array}}{\ \ \ \ \ {\color{Red} 6} }$

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

$\frac{\begin{array}[b]{r}{\color{Red} 3}7\\ -\ {\color{Red} 1}1\end{array}}{\ \ \ \ {\color{Red} 2}6}$

Your final answer should be

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Example Question #41 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}58\\ -\ 30\end{array}}{\space }$

Possible Answers:

Correct answer:

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:

$\frac{\begin{array}[b]{r}5{\color{Red} 8}\\ -\ 3{\color{Red} 0}\end{array}}{\ \ \ \ \ {\color{Red} 8} }$

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

$\frac{\begin{array}[b]{r}{\color{Red} 5}8\\ -\ {\color{Red} 3}0\end{array}}{\ \ \ \ {\color{Red} 2}8}$

Your final answer should be

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Example Question #41 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Solve:

$\frac{\begin{array}[b]{r}69\\ -\ 18\end{array}}{\space }$

Possible Answers:

Correct answer:

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:

$\frac{\begin{array}[b]{r}6{\color{Red} 9}\\ -\ 1{\color{Red} 8}\end{array}}{\ \ \ \ \ {\color{Red} 1} }$

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

$\frac{\begin{array}[b]{r}{\color{Red} 6}9\\ -\ {\color{Red} 1}8\end{array}}{\ \ \ \ {\color{Red} 5}1}$

Your final answer should be

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Example Question #1062 : Number & Operations In Base Ten

Solve:

$\frac{\begin{array}[b]{r}25\\ -\ 13\end{array}}{\space }$

Possible Answers:

Correct answer:

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:

$\frac{\begin{array}[b]{r}2{\color{Red} 5}\\ -\ 1{\color{Red} 3}\end{array}}{\ \ \ \ \ {\color{Red} 2} }$

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

$\frac{\begin{array}[b]{r}{\color{Red} 2}5\\ -\ {\color{Red} 1}3\end{array}}{\ \ \ {\color{Red} 1}2}$

Your final answer should be

Report an Error

Example Question #1063 : Number & Operations In Base Ten

Solve:

$\frac{\begin{array}[b]{r}68\\ -\ 33\end{array}}{\space }$

Possible Answers:

Correct answer:

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:

$\frac{\begin{array}[b]{r}6{\color{Red} 8}\\ -\ 3{\color{Red} 3}\end{array}}{\ \ \ \ \ {\color{Red} 5} }$

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

$\frac{\begin{array}[b]{r}{\color{Red} 6}8\\ -\ {\color{Red} 3}3\end{array}}{\ \ \ \ {\color{Red} 3}5}$

Your final answer should be

Report an Error

Example Question #1064 : Number & Operations In Base Ten

Solve the following:

$\frac{\begin{array}[b]{r}32\\ -\ 19\end{array}}{\space }$

Possible Answers:

Correct answer:

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:

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

$\frac{\begin{array}[b]{r}^{2} \not32\\ -\ 19\end{array}}{\space }$

Remember, we've borrowed from the tens place, and one ten is equal to . We now add that to the digit in the ones place, 2+10=12 . Your work should look something like this:

$\frac{\begin{array}[b]{r}^{2} \not3\ ^{12}\not2\\ -\ 1 \ \ \ \ \ 9\end{array}}{\space }$

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

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

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

$\frac{\begin{array}[b]{r}2\\ -\ 1\end{array}}{\ \ \ 1}$

Your final answer should be

$\frac{\begin{array}[b]{r}^{2} \not3\ ^{12}\not2\\ -\ 1 \ \ \ \ \ 9\end{array}}{\ \ \ 1\ \ \ \ \ 3}$

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

Example Question #1051 : Number & Operations In Base Ten

Example Question #1052 : Number & Operations In Base Ten

Example Question #41 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #41 : Add And Subtract Within 100: Ccss.Math.Content.2.Nbt.B.5

Example Question #1062 : Number & Operations In Base Ten

Example Question #1063 : Number & Operations In Base Ten

Example Question #1064 : Number & Operations In Base Ten

All Common Core: 2nd Grade Math Resources

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