Solve for the Missing Addend: ? + 900 = 900

Q: Is 0 really a number I can add?

Yes! Zero is a real number and a very important one. The identity property tells us that any number plus zero equals that same number.

Q: How do I solve equations like this step by step?

Use inverse operations: Start with: ? + 900 = 900Subtract 900 from both sidesGet: ? = 900 - 900 = 0

Q: Can I check my answer a different way?

Absolutely! Besides substitution, think logically: "What plus 900 gives me 900?" Only zero makes sense because 900 is already the target number.

Addition Identity Property with Zero

$?+900=900$

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations

00:00 Complete the missing value

00:04 Any number plus 0 equals the number itself

00:11 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

$?+900=900$

Step-by-step solution

To solve this problem, we'll apply the basic property of addition involving zero:

We start with the equation given in the problem:

? + 900 = 900

Step 1: To find the unknown number $x$ , observe that adding 900 to an unknown number results in 900.
Step 2: Subtract 900 from both sides to isolate $x$ :
$x + 900 - 900 = 900 - 900$
Step 3: Simplifying gives:
$x = 0$
Step 4: Thus, the missing number is 0, as adding 0 to any number retains the original number due to the identity property of addition.

Therefore, the solution to the problem is $x = 0$ .

Final Answer

Key Points to Remember

Essential concepts to master this topic

Identity Property: Adding zero to any number leaves it unchanged
Technique: Subtract 900 from both sides: x = 900 - 900
Check: Substitute back: 0 + 900 = 900 ✓

Common Mistakes

Avoid these frequent errors

Thinking the answer must be a large number
Don't assume the missing addend is 900 or another large number = 1800 total! This ignores that zero is a valid answer. Always consider that adding zero to any number gives the same number.

Practice Quiz

Test your knowledge with interactive questions

$1\times1000=$

FAQ

Everything you need to know about this question

Why is the answer 0 and not 900?

Think about it: if you already have 900, what do you need to add to still get 900? Nothing! Adding 0 keeps the number the same due to the identity property of addition.

Is 0 really a number I can add?

Yes! Zero is a real number and a very important one. The identity property tells us that any number plus zero equals that same number.

How do I solve equations like this step by step?

Use inverse operations:

Start with: ? + 900 = 900
Subtract 900 from both sides
Get: ? = 900 - 900 = 0

What if the numbers were different, like ? + 50 = 50?

The same rule applies! Whatever number you're adding to itself, the missing addend is always 0. Try: 0 + 50 = 50 ✓

Can I check my answer a different way?

Absolutely! Besides substitution, think logically: "What plus 900 gives me 900?" Only zero makes sense because 900 is already the target number.

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