Common Core: 2nd Grade Math : Subtract within 1000

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

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Example Questions

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Example Question #1 : Subtract Within 1000

Solve:

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:

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:

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

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

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

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

Your final answer should be 

Example Question #2 : Subtract Within 1000

Solve:

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:

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

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:

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:

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

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

Your final answer should be 

Example Question #3 : Subtract Within 1000

Solve:

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:

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

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:

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:

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

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

Your final answer should be 

Example Question #4 : Subtract Within 1000

Solve:

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:

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:

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

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

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

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:

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:

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

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

Your final answer should be 

Example Question #5 : Subtract Within 1000

Solve:

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:

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

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:

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:

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

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

Your final answer should be 

 

Example Question #6 : Subtract Within 1000

Solve:

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:

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

 

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

Your final answer should be 

Example Question #7 : Subtract Within 1000

Solve:

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:

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

 

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

Your final answer should be 

Example Question #8 : Subtract Within 1000

Solve:

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:

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

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

Your final answer should be 

Example Question #9 : Subtract Within 1000

Solve:

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:

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

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

Your final answer should be 

Example Question #10 : Subtract Within 1000

Solve:

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:

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

 

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

Your final answer should be 

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