Place Value Subtraction: Remove 5 Tens and 4 Ones from 55 Blocks

Regrouping Subtraction with Multi-Step Place Value

If we have 55 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

If we have 55 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?

2

Step-by-step solution

To determine how many blocks remain, follow these steps:

  • Step 1: Calculate how many blocks 5 tens represent: 5×10=50 5 \times 10 = 50 .
  • Step 2: Add the 4 individual blocks being removed: 50+4=54 50 + 4 = 54 .
  • Step 3: Subtract the total removed blocks from the original number of blocks: 5554=1 55 - 54 = 1 .

After performing these calculations, we find that the number of blocks remaining is 1 1 .

Therefore, the solution to the problem is 1 1 .

3

Final Answer

1 1

Key Points to Remember

Essential concepts to master this topic
  • Place Value Rule: Convert tens to ones before subtracting: 5 tens = 50 ones
  • Technique: Add removed amounts first: 50+4=54 50 + 4 = 54 total blocks removed
  • Check: Verify with original total: 5554=1 55 - 54 = 1 remaining block ✓

Common Mistakes

Avoid these frequent errors
  • Subtracting tens and ones separately instead of converting first
    Don't calculate 55 - 5 - 4 = 46! This treats tens as individual units instead of groups of 10, giving a completely wrong answer. Always convert place values first: 5 tens = 50 ones, then add all removed blocks before subtracting from the total.

Practice Quiz

Test your knowledge with interactive questions

If we have 85 blocks in total, how many blocks will remain if we remove 4 tens and 1 one?

FAQ

Everything you need to know about this question

Why can't I just subtract 5 tens and 4 ones separately?

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Because place value matters! When you remove '5 tens', you're actually removing 5×10=50 5 \times 10 = 50 individual blocks, not just 5 blocks. You need to convert everything to the same unit first.

How do I know if I converted the tens correctly?

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Remember: 1 ten = 10 ones. So 5 tens = 5×10=50 5 \times 10 = 50 ones. Always multiply the number of tens by 10 to get the equivalent ones.

What if the problem had hundreds or thousands too?

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Same rule applies! Convert everything to the smallest unit: 1 hundred = 100 ones, 1 thousand = 1000 ones. Then add up all the blocks being removed before subtracting.

Can I visualize this problem differently?

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Yes! Think of it like removing whole groups plus extras: You're taking away 5 complete groups of 10 blocks each, plus 4 individual blocks. That's 50+4=54 50 + 4 = 54 blocks total.

How do I check if my answer makes sense?

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Ask yourself: Does removing 54 blocks from 55 blocks leave just 1 block? Also, your remaining blocks should always be less than what you started with.

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