Solve: 56+0?57-0 Finding the Missing Digit in Addition

Q: Why do I need to simplify when it's just adding and subtracting zero?

Great question! Even though adding or subtracting zero doesn't change the value, showing each step helps you understand the process and avoid mistakes on harder problems.

Q: What if the numbers were the same after simplifying?

If both sides simplified to the same number, then you would use the equals sign (=) instead of less than or greater than!

Q: How do I remember which way the less than symbol points?

Think of the symbol as a hungry mouth - it always opens toward the larger number. So in 56

Q: Can I have negative numbers in these problems?

Absolutely! The same rules apply: simplify first, then compare. Remember that negative numbers get smaller as they move away from zero.

Q: What's the difference between < and ≤?

Great observation! The symbol strictly less than, while ≤ means less than or equal to. For this problem, we use

Number Comparison with Zero Operations

$56+0?57-0$

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations

00:00 Identify the correct mathematical sign

00:03 Any number plus 0 is always equal to itself

00:11 Any number minus 0 is always equal to itself

00:19 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

$56+0?57-0$

Step-by-step solution

To solve this problem, we will follow these steps:

Step 1: Simplify $56 + 0 - 0$ . Since adding or subtracting zero does not affect the number, this simplifies to $56$ .
Step 2: The expression $57 - 0$ simplifies to $57$ because subtracting zero does not change the value.
Step 3: Now that we have $56$ and $57$ , we need to determine the appropriate relational operator between these two numbers.

Comparing $56$ and $57$ :
- We know that $56$ is less than $57$ .

Therefore, the correct relational operator is $<$ .

Final Answer

Key Points to Remember

Essential concepts to master this topic

Zero Rule: Adding or subtracting zero never changes a number
Technique: Simplify 56+0-0 = 56 and 57-0 = 57 first
Check: Compare final numbers: 56 is less than 57, so 56 < 57 ✓

Common Mistakes

Avoid these frequent errors

Ignoring the zero operations and guessing the comparison
Don't just look at 56 and 57 without simplifying first = missed understanding! You might pick the wrong symbol by rushing. Always simplify each side completely, then compare the final numbers.

Practice Quiz

Test your knowledge with interactive questions

$$ 2+0= $$

FAQ

Everything you need to know about this question

Why do I need to simplify when it's just adding and subtracting zero?

Great question! Even though adding or subtracting zero doesn't change the value, showing each step helps you understand the process and avoid mistakes on harder problems.

What if the numbers were the same after simplifying?

If both sides simplified to the same number, then you would use the equals sign (=) instead of less than or greater than!

How do I remember which way the less than symbol points?

Think of the symbol as a hungry mouth - it always opens toward the larger number. So in 56 < 57, the mouth opens toward 57 because it's bigger!

Can I have negative numbers in these problems?

Absolutely! The same rules apply: simplify first, then compare. Remember that negative numbers get smaller as they move away from zero.

What's the difference between < and ≤?

Great observation! The symbol < means strictly less than, while ≤ means less than or equal to. For this problem, we use < because 56 is strictly less than 57.

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