Find the Missing Sign in Expression: 98-20□18+60

Comparison Operations with Simple Arithmetic

Choose the correct sign:

982018+60 98-20\Box18+60

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Choose the correct sign:

982018+60 98-20\Box18+60

2

Step-by-step solution

To solve this problem, we need to determine which operator between = = , < < , or > > makes the mathematical expression 982018+60 98 - 20 \Box 18 + 60 valid. Let's perform each step carefully.

First, we'll compute both sides of the expression:

  • Calculate the left expression: 9820=78 98 - 20 = 78 .
  • Calculate the right expression: 18+60=78 18 + 60 = 78 .

Now, let's compare the results. We have 78 78 on the left and 78 78 on the right:

Since 78=78 78 = 78 , the correct operator to use is = = .

Therefore, the expression is correctly written as:

9820=18+60 98 - 20 = 18 + 60

Thus, the correct sign is = = .

3

Final Answer

= =

Key Points to Remember

Essential concepts to master this topic
  • Order: Calculate each side completely before comparing the results
  • Technique: Left side: 98 - 20 = 78, Right side: 18 + 60 = 78
  • Check: Both sides equal 78, so 78 = 78 confirms the answer ✓

Common Mistakes

Avoid these frequent errors
  • Comparing numbers before completing calculations
    Don't compare 98 and 18 directly without finishing the math = wrong comparison! This ignores the other operations and gives incorrect results. Always calculate both complete sides first, then compare the final values.

Practice Quiz

Test your knowledge with interactive questions

If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?

FAQ

Everything you need to know about this question

Do I need to follow order of operations here?

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Yes! Even though this looks like a comparison problem, you still need to calculate each side completely using proper order of operations before comparing the results.

What if the two sides aren't equal?

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Then you'd use either < < or > > depending on which side is larger. Always calculate first, then decide which symbol fits.

Can I rearrange the numbers to make it easier?

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No! You must work with the expression exactly as given. Rearranging would change the problem completely and give you a different answer.

How do I remember which way < and > point?

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The symbol always points to the smaller number. Think of it like a hungry mouth that wants to eat the bigger number! 3<5 3 < 5 means 3 is less than 5.

What if I get different numbers on each side?

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Then you compare them normally! If the left side gives you 15 and the right side gives you 23, then 15<23 15 < 23 , so you'd choose the less than symbol.

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