Subtract 9 Units from 27 Units: Basic Arithmetic Solution

Basic Subtraction with Two-Digit Numbers

What do you get if you subtract 9 units from 27 units?

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

What do you get if you subtract 9 units from 27 units?

2

Step-by-step solution

To solve this problem, we need to subtract one number from another. Here's a step-by-step approach:

  • Identify the numbers: We need to subtract 9 units from 27 units.
  • Set up the subtraction operation: 279 27 - 9 .
  • Perform the subtraction: Subtracting 9 from 27 involves straightforward arithmetic:
    The operation is 279=18 27 - 9 = 18 .
  • Simplify: The difference calculated is 18.

Therefore, the result of subtracting 9 units from 27 units is 18 18 .

3

Final Answer

18 18

Key Points to Remember

Essential concepts to master this topic
  • Setup: Write the larger number first, then subtract the smaller
  • Technique: Calculate 279 27 - 9 by counting down or using place value
  • Check: Add your answer back: 18+9=27 18 + 9 = 27

Common Mistakes

Avoid these frequent errors
  • Switching the order of numbers in subtraction
    Don't write 9 - 27 instead of 27 - 9 = negative result! Subtraction is not commutative like addition, so order matters completely. Always subtract the smaller number from the larger number when finding the difference.

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

Why can't I just do 9 - 27 instead?

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Great question! Subtraction order matters. When you "subtract 9 from 27," it means start with 27 and take away 9. If you do 9 - 27, you'd get a negative number (-18), which isn't what the problem is asking for.

What's the easiest way to subtract 9 from 27?

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You can count backwards from 27: 27, 26, 25, 24, 23, 22, 21, 20, 19, 18. Or use place value: 20 - 9 = 11, then add the remaining 7 to get 18!

How do I know my answer is correct?

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Use addition to check! If 27 - 9 = 18, then 18 + 9 should equal 27. Since 18+9=27 18 + 9 = 27 , your answer is right!

What does 'subtract from' mean exactly?

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"Subtract A from B" means B - A. So "subtract 9 from 27" means 27 - 9. Think of it as: start with 27 units and take away 9 units.

Can I use a number line for this problem?

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Absolutely! Start at 27 on the number line and jump left 9 spaces. You'll land on 18. Number lines are great visual tools for subtraction!

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