Solve the Addition Equation: Finding the Missing Number in 60 + ? = 60

Q: Why isn't the answer 60 if we see 60 in the problem?

Just because 60 appears in the equation doesn't mean it's the answer! Remember: $ 60 + 60 = 120 $, not 60. We need the number that keeps 60 unchanged.

Q: What is the zero property in addition?

The zero property (or additive identity) says that adding zero to any number gives you the same number: $ a + 0 = a $. Zero is special because it doesn't change other numbers!

Q: How do I solve equations like 60 + ? = 60?

Ask yourself: "What number can I add to 60 to still get 60?" The only number that works is zero, because adding anything else would make the sum bigger or smaller.

Q: What if the equation was 60 + ? = 65 instead?

Then you'd subtract: $ ? = 65 - 60 = 5 $. But in our problem, since both sides equal 60, we need zero to keep the balance.

Q: Can I check my answer another way?

Yes! Use subtraction to check: If 60 + ? = 60, then ? = 60 - 60 = 0. Both methods should give you the same answer.

Addition Properties with Zero Identity

$60+?=60$

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations

00:00 Complete the missing

00:03 Any number plus 0 equals the number itself

00:10 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

$60+?=60$

Step-by-step solution

To solve this problem, we use the property of zero in addition. This property states that adding zero to any number does not change the value of that number. Mathematically, this is written as $a + 0 = a$ .

Given the equation:

$60 + ? = 60$

Step 1: Recognize that we want the sum of 60 and the unknown to still be 60.

Step 2: According to the property, the number that, when added to 60, results in 60 must be zero. Therefore, we set $? = 0$ .

The correct choice from the options provided is:

Choice 4: $0$

Therefore, the correct answer is $0$ .

Final Answer

Key Points to Remember

Essential concepts to master this topic

Identity Rule: Adding zero to any number keeps the number unchanged
Technique: If 60 + ? = 60, then ? must equal 0
Check: Substitute back: 60 + 0 = 60 ✓

Common Mistakes

Avoid these frequent errors

Thinking the missing number should equal 60
Don't assume ? = 60 because 60 + 60 = 120, not 60! This ignores that we need the same result after adding. Always remember that only zero keeps a number unchanged when added.

Practice Quiz

Test your knowledge with interactive questions

$1\times1000=$

FAQ

Everything you need to know about this question

Why isn't the answer 60 if we see 60 in the problem?

Just because 60 appears in the equation doesn't mean it's the answer! Remember: $60 + 60 = 120$ , not 60. We need the number that keeps 60 unchanged.

What is the zero property in addition?

The zero property (or additive identity) says that adding zero to any number gives you the same number: $a + 0 = a$ . Zero is special because it doesn't change other numbers!

How do I solve equations like 60 + ? = 60?

Ask yourself: "What number can I add to 60 to still get 60?" The only number that works is zero, because adding anything else would make the sum bigger or smaller.

What if the equation was 60 + ? = 65 instead?

Then you'd subtract: $? = 65 - 60 = 5$ . But in our problem, since both sides equal 60, we need zero to keep the balance.

Can I check my answer another way?

Yes! Use subtraction to check: If 60 + ? = 60, then ? = 60 - 60 = 0. Both methods should give you the same answer.

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