Verify Decimal Subtraction: Is 99.38 - 99.38 Correctly Written?

Decimal Alignment with Subtraction Verification

Determine whether the exercise is correctly written or not.

The position of the decimal point corresponds.

99.38-99.38

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:12 Let's check if the decimal point is in the right place.
00:16 Next, we'll use long subtraction to position the decimal point.
00:21 Remember, in long subtraction, line up decimal points directly above each other.
00:26 In our problem, the decimal points are aligned perfectly, great!
00:33 Now, let's examine the number we're subtracting.
00:37 The numbers are the same, so our setup is correct.
00:42 And that's how we solve this problem. Well done!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Determine whether the exercise is correctly written or not.

The position of the decimal point corresponds.

99.38-99.38

2

Step-by-step solution

To effectively assess the problem, we should confirm if the decimal points in the subtraction of two identical numbers, 99.38−99.3899.38 - 99.38, are aligned correctly.

Step 1: The numbers involved in the subtraction are 99.3899.38 and 99.3899.38, both having the same number of digits before and after the decimal point.

Step 2: Check the alignment of the decimal points in the subtraction setup. In properly written subtraction involving decimals, the decimal points must align vertically to ensure correct digit placement.

Step 3: The setup displays the numbers:

  • 99.3899.38
  • 99.3899.38

Each digit before and after the decimal is in perfect vertical alignment, confirming correct decimal point alignment.

Conclusion: The exercise is correctly written in terms of decimal alignment.

The correct answer to the problem is True.

3

Final Answer

True

Key Points to Remember

Essential concepts to master this topic
  • Alignment Rule: Decimal points must be vertically aligned in all operations
  • Visual Check: Line up 99.3899.38 over 99.3899.38 column by column
  • Verification: Each digit position matches perfectly when decimals align ✓

Common Mistakes

Avoid these frequent errors
  • Ignoring decimal point alignment
    Don't write decimals randomly without aligning points = wrong digit placement! When decimal points aren't aligned, you subtract wrong place values (tens from ones, etc.). Always line up decimal points vertically before calculating.

Practice Quiz

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FAQ

Everything you need to know about this question

Why is decimal alignment so important in subtraction?

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Decimal alignment ensures you're subtracting like place values: tenths from tenths, hundredths from hundredths. Without proper alignment, you might subtract a tenth from a hundredth, giving completely wrong results!

How can I tell if decimals are properly aligned?

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Draw an imaginary vertical line through the decimal points. If all decimal points line up on this line, and digits in the same columns represent the same place values, you're good to go!

What happens when I subtract the same decimal from itself?

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When you subtract identical numbers like 99.38−99.3899.38 - 99.38, the result is always zero. This makes it easy to check if your setup is correct!

Do I need to add zeros if the decimals have different lengths?

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Yes! If subtracting 99.38−99.399.38 - 99.3, rewrite the second number as 99.3099.30 to match decimal places. This ensures proper alignment.

Can I check my decimal alignment before calculating?

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  • Make sure decimal points form a straight vertical line
  • Check that digits in each column represent the same place value
  • Verify you have the same number of decimal places (add zeros if needed)

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