Solve the Addition Equation: Finding the Missing Number in 1000 + □ = 1500

Q: Why do I subtract instead of add to find the missing number?

In addition equations like $ a + b = c $, if you know a and c, you need subtraction to find b. Think of it as "undoing" the addition!

Q: How can I remember which number to subtract from which?

Always subtract the known addend from the total sum. In $ 1000 + \Box = 1500 $, subtract 1000 from 1500, not the other way around!

Q: Can I solve this by moving numbers to the other side?

Absolutely! You can rewrite $ 1000 + \Box = 1500 $ as $ \Box = 1500 - 1000 $. This is the same as our subtraction method!

Q: How do I check if my answer is correct?

Substitute your answer back into the original equation. Replace the box with your answer and see if both sides are equal: $ 1000 + 500 = 1500 $ ✓

Addition Equations with Missing Addends

Complete the following equation:

$1000+\Box=1500$

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

Complete the following equation:

$1000+\Box=1500$

Step-by-step solution

To find the missing number in the equation $1000 + \Box = 1500$ , we will follow these steps:

Step 1: Identify the known values. We know $1000$ (the known addend) and $1500$ (the total sum).
Step 2: Use subtraction to find the missing number. The missing number is the difference between the total sum and the known addend.

Now, perform the calculation:

Subtract $1000$ from $1500$ :

$\Box = 1500 - 1000$

$\Box = 500$

Thus, the missing number is $500$ .

Final Answer

$500$

Key Points to Remember

Essential concepts to master this topic

Rule: Use subtraction to find the missing addend in addition equations
Technique: Subtract the known addend from sum: $\Box = 1500 - 1000 = 500$
Check: Verify by substituting back: $1000 + 500 = 1500$ ✓

Common Mistakes

Avoid these frequent errors

Adding instead of subtracting to find the missing number
Don't add 1000 + 1500 = 2500! This gives you a completely wrong answer because you're combining both given numbers instead of finding their difference. Always subtract the known addend from the sum to find the missing addend.

Practice Quiz

Test your knowledge with interactive questions

Choose the correct answer:

$693+705=\text{ ?}$

FAQ

Everything you need to know about this question

Why do I subtract instead of add to find the missing number?

In addition equations like $a + b = c$ , if you know a and c, you need subtraction to find b. Think of it as "undoing" the addition!

How can I remember which number to subtract from which?

Always subtract the known addend from the total sum. In $1000 + \Box = 1500$ , subtract 1000 from 1500, not the other way around!

What if I get a negative answer?

Check your subtraction! If you subtracted correctly and still got negative, the known addend might be larger than the sum, which means there's an error in the original problem.

Can I solve this by moving numbers to the other side?

Absolutely! You can rewrite $1000 + \Box = 1500$ as $\Box = 1500 - 1000$ . This is the same as our subtraction method!

How do I check if my answer is correct?

Substitute your answer back into the original equation. Replace the box with your answer and see if both sides are equal: $1000 + 500 = 1500$ ✓

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Natural numbers up to 10,000 questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime