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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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Example Questions

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Example Question #3 :Subtract Within 1000

Solve:

$\frac{\begin{array}[b]{r}316\\ -\ 250\end{array}}{\space }$

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:

$\frac{\begin{array}[b]{r}6\\ -\ 0\end{array}}{\ \ \ 6 }$

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

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

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

$\frac{\begin{array}[b]{r}^{2} \not316\\ -\ 250\end{array}}{\space }$

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

$\frac{\begin{array}[b]{r}^{2} \not3\ ^{11}\not1\ \ \ \ \ 6\\ -\ 2 \ \ \ \ \ 5\ \ \ \ \ 0\end{array}}{\space }$

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

$\frac{\begin{array}[b]{r}11\\ -\ 5\end{array}}{\ \ \ 6}$

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

$\frac{\begin{array}[b]{r}2\\ -\ 2\end{array}}{\ \ \ 0}$

哟ur final answer should be

$\frac{\begin{array}[b]{r}^{2} \not3\ ^{11}\not1\ \ \ \ \ 6\\ -\ 2 \ \ \ \ \ 5\ \ \ \ \ 0\end{array}}{\ \ \ \ \ \ \ \ \ \ 6\ \ \ \ \ 6}$

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Example Question #4 :Subtract Within 1000

Solve:

$\frac{\begin{array}[b]{r}325\\ -\ 289\end{array}}{\space }$

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:

$\frac{\begin{array}[b]{r}5\\ -\ 9\end{array}}{\ \ \ }$

$\frac{\begin{array}[b]{r}3 ^{1}\not2 \ \ \ 5\\ -\ 2\ \ \ 8\ \ \ 9\end{array}}{\space }$

Remember, we've borrowedfrom the tens place, so we can put ain front of the number in the ones place. So far, your work should look something like this:

$\frac{\begin{array}[b]{r}3 ^{1}\not2 \ ^{15}\not5\\ -\ 2 \ \ \ 8\ \ \ \ \ 9\end{array}}{\space }$

Now, let's subtract the numbers in the ones place:

$\frac{\begin{array}[b]{r}15\\ -\ 9\end{array}}{\ \ \ 6 }$

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

$\frac{\begin{array}[b]{r}1\\ -\ 8\end{array}}{\ \ \ }$

$\frac{\begin{array}[b]{r}^{2}\not3 ^{1}\not2 \ ^{15}\not5\\ -\ 2 \ \ \ 8\ \ \ \ \ 9\end{array}}{\space }$

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

$\frac{\begin{array}[b]{r}^{2}\not3 ^{11}\not2 \ ^{15}\not5\\ -\ 2 \ \ \ 8\ \ \ \ \ 9\end{array}}{\space }$

Now, let's subtract the numbers in the tens place:

$\frac{\begin{array}[b]{r}11\\ -\ 8\end{array}}{\ \ \ 3 }$

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

$\frac{\begin{array}[b]{r}2\\ -\ 2\end{array}}{\ \ \ 0}$

哟ur final answer should be

$\frac{\begin{array}[b]{r}^{2}\not3 ^{11}\not2 \ ^{15}\not5\\ -\ 2 \ \ \ 8\ \ \ \ \ 9\end{array}}{\ \ \ \ \ \ \ \ 3\ \ \ \ \ 6 }$

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Example Question #5 :Subtract Within 1000

Solve:

$\frac{\begin{array}[b]{r}818\\ -\ 181\end{array}}{\space }$

Possible Answers:

634

637

636

635

Correct answer:

637

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:

$\frac{\begin{array}[b]{r}8\\ -\ 1\end{array}}{\ \ \ 7 }$

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

$\frac{\begin{array}[b]{r}1\\ -\ 8\end{array}}{\ \ \ }$

$\frac{\begin{array}[b]{r}^{7} \not818\\ -\ 181\end{array}}{\space }$

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

$\frac{\begin{array}[b]{r}^{7} \not8\ ^{11}\not1\ \ \ \ \ 8\\ -\ 1 \ \ \ \ \ 8\ \ \ \ \ 1\end{array}}{\space }$

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

$\frac{\begin{array}[b]{r}11\\ -\ 8\end{array}}{\ \ \ 3}$

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

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

哟ur final answer should be 637

$\frac{\begin{array}[b]{r}^{7} \not8\ ^{11}\not1\ \ \ \ \ 8\\ -\ 1 \ \ \ \ \ 8\ \ \ \ \ 1\end{array}}{\ \ \ 6 \ \ \ \ \ 3\ \ \ \ \ 7 }$

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Example Question #6 :Subtract Within 1000

Solve:

$\frac{\begin{array}[b]{r}979\\ -\ 930\end{array}}{\space }$

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:

$\frac{\begin{array}[b]{r}9\\ -\ 0\end{array}}{\ \ \ 9 }$

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

$\frac{\begin{array}[b]{r}7\\ -\ 3\end{array}}{\ \ \ 4 }$

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

$\frac{\begin{array}[b]{r}9\\ -\ 9\end{array}}{\ \ \ 0}$

哟ur final answer should be

$\frac{\begin{array}[b]{r}979\\ -\ 930\end{array}}{\ \ \ \ \ 49}$

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Example Question #7 :Subtract Within 1000

Solve:

$\frac{\begin{array}[b]{r}439\\ -\ 438\end{array}}{\space }$

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:

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

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

$\frac{\begin{array}[b]{r}3\\ -\ 3\end{array}}{\ \ \ 0 }$

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

$\frac{\begin{array}[b]{r}4\\ -\ 4\end{array}}{\ \ \ 0}$

哟ur final answer should be

$\frac{\begin{array}[b]{r}439\\ -\ 438\end{array}}{\ \ \ \ \ \ \ 1}$

Report an Error

Example Question #8 :Subtract Within 1000

Solve:

$\frac{\begin{array}[b]{r}810\\ -\ 110\end{array}}{\space }$

Possible Answers:

700

702

701

703

Correct answer:

700

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:

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

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

$\frac{\begin{array}[b]{r}8\\ -\ 1\end{array}}{\ \ \ 7}$

哟ur final answer should be 700

$\frac{\begin{array}[b]{r}810\\ -\ 110\end{array}}{\ \ \ 700}$

Report an Error

Example Question #9 :Subtract Within 1000

Solve:

$\frac{\begin{array}[b]{r}596\\ -\ 335\end{array}}{\space }$

Possible Answers:

261

262

263

260

Correct answer:

261

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:

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

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

$\frac{\begin{array}[b]{r}9\\ -\ 3\end{array}}{\ \ \ 6 }$

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

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

哟ur final answer should be 261

$\frac{\begin{array}[b]{r}596\\ -\ 335\end{array}}{\ \ \ \ 261}$

Report an Error

Example Question #10 :Subtract Within 1000

Solve:

$\frac{\begin{array}[b]{r}374\\ -\ 231\end{array}}{\space }$

Possible Answers:

143

142

140

141

Correct answer:

143

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:

$\frac{\begin{array}[b]{r}4\\ -\ 1\end{array}}{\ \ \ 3 }$

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

$\frac{\begin{array}[b]{r}7\\ -\ 3\end{array}}{\ \ \ 4 }$

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

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

哟ur final answer should be 143

$\frac{\begin{array}[b]{r}374\\ -\ 231\end{array}}{\ \ \ \ 143}$

Report an Error

Example Question #11 :Subtract Within 1000

Solve:

$\frac{\begin{array}[b]{r}555\\ -\ 123\end{array}}{\space }$

Possible Answers:

430

432

431

434

Correct answer:

432

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:

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

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

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

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

$\frac{\begin{array}[b]{r}5\\ -\ 1\end{array}}{\ \ \ 4}$

哟ur final answer should be 432

$\frac{\begin{array}[b]{r}555\\ -\ 123\end{array}}{\ \ \ \ 432}$

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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 #3 :Subtract Within 1000

Example Question #4 :Subtract Within 1000

Example Question #5 :Subtract Within 1000

Example Question #6 :Subtract Within 1000

Example Question #7 :Subtract Within 1000

Example Question #8 :Subtract Within 1000

Example Question #9 :Subtract Within 1000

Example Question #10 :Subtract Within 1000

Example Question #11 :Subtract Within 1000

All Common Core: 2nd Grade Math Resources

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