Solve the Equation: Finding the Missing Number in ?-0=705

Q: Why doesn't subtracting zero change the number?

Subtraction means taking away. When you take away zero (nothing), you're left with exactly what you started with! This is called the identity property of subtraction.

Q: Is this the same as adding zero?

Yes! Both adding zero and subtracting zero leave numbers unchanged. These are fundamental properties that help us solve equations quickly.

Q: What if the equation was 0 - ? = 705?

That would be completely different! Then you'd have $ ? = -705 $ because $ 0 - 705 = -705 $. Order matters in subtraction!

Q: How do I remember this property?

Think of it like your piggy bank: if you take out zero dollars, you still have the same amount as before. Subtracting nothing changes nothing!

Q: Are there other numbers that work like zero?

For subtraction, only zero has this special property. However, multiplying by 1 or dividing by 1 also leaves numbers unchanged - these are different identity properties!

Zero Subtraction with Identity Property

$?-0=705$

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations

00:00 Find the unknown

00:04 Any number minus 0 equals the number itself

00:08 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

$?-0=705$

Step-by-step solution

To solve this problem, we'll follow these steps:

Step 1: Understand that the problem involves simple subtraction of zero.
Step 2: Apply the property of zero in subtraction, $a - 0 = a$ .
Step 3: Recognize that the given equation is $? - 0 = 705$ .

Now, let's work through each step:
Step 1: The equation $? - 0 = 705$ is given.
Step 2: According to the property of zero: $a - 0 = a$ , thus, $? = 705$ .
Step 3: Therefore, the unknown number or value of $?$ is simply 705, since subtracting zero doesn’t change the number.

Hence, the solution to the problem is $705$ .

Final Answer

705

Key Points to Remember

Essential concepts to master this topic

Identity Property: Any number minus zero equals that same number
Technique: In $? - 0 = 705$ , the missing number is 705
Check: Verify by substituting: 705 - 0 = 705 ✓

Common Mistakes

Avoid these frequent errors

Overthinking the zero subtraction property
Don't try to calculate 705 - 0 step by step or think it's a trick question = confusion and wrong answers! The zero subtraction property is straightforward: subtracting zero never changes a number. Always remember that any number minus zero equals itself.

Practice Quiz

Test your knowledge with interactive questions

$1\times1000=$

FAQ

Everything you need to know about this question

Why doesn't subtracting zero change the number?

Subtraction means taking away. When you take away zero (nothing), you're left with exactly what you started with! This is called the identity property of subtraction.

Is this the same as adding zero?

Yes! Both adding zero and subtracting zero leave numbers unchanged. These are fundamental properties that help us solve equations quickly.

What if the equation was 0 - ? = 705?

That would be completely different! Then you'd have $? = -705$ because $0 - 705 = -705$ . Order matters in subtraction!

How do I remember this property?

Think of it like your piggy bank: if you take out zero dollars, you still have the same amount as before. Subtracting nothing changes nothing!

Are there other numbers that work like zero?

For subtraction, only zero has this special property. However, multiplying by 1 or dividing by 1 also leaves numbers unchanged - these are different identity properties!

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