Complete the Expression: Finding the Missing Sign in 20+5□45-20

Expression Comparison with Simple Arithmetic

Choose the appropriate sign:

20+54520 20+5\Box45-20

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Choose the appropriate sign:

20+54520 20+5\Box45-20

2

Step-by-step solution

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

  • Step 1: Calculate 20+520 + 5
  • Step 2: Calculate 452045 - 20
  • Step 3: Compare the results from Step 1 and Step 2

Now, let's work through each step:

Step 1: Calculate 20+520 + 5.
20+5=2520 + 5 = 25.

Step 2: Calculate 452045 - 20.
4520=2545 - 20 = 25.

Step 3: Compare the two calculated results.
We have 2525 on both sides, which means 25=2525 = 25.

Therefore, the appropriate sign to choose is the equals sign, ==.

The solution to the problem is = = .

3

Final Answer

= =

Key Points to Remember

Essential concepts to master this topic
  • Rule: Calculate each side separately before comparing values
  • Technique: Left side: 20 + 5 = 25, Right side: 45 - 20 = 25
  • Check: Both sides equal 25, so 25 = 25 confirms the equality ✓

Common Mistakes

Avoid these frequent errors
  • Trying to solve across the comparison sign
    Don't treat the □ as an unknown variable to solve for = creates confusion! This isn't an equation to solve but a comparison to make. Always calculate both sides completely 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

How do I know which comparison sign to use?

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Calculate both sides completely first! If the left result is bigger, use >. If the right result is bigger, use <. If they're exactly the same, use =.

What's the difference between this and solving equations?

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In equations, you find an unknown value. Here, you're just comparing two known results. Calculate each side separately, then pick the right comparison sign!

Do I follow order of operations here?

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Yes! Always follow PEMDAS/BODMAS. In this problem, addition and subtraction are done left to right, so 20+5=25 20 + 5 = 25 and 4520=25 45 - 20 = 25 .

What if the numbers were different and not equal?

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Same process! Calculate both sides. If left side = 30 and right side = 20, then 30 > 20, so you'd choose the greater than sign.

Can I work backwards from the answer choices?

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You could, but it's faster to just calculate both sides! This direct method always works and helps you understand what's really happening in the expression.

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