Solve Decimal Subtraction: Calculate 0.5 - 0.3

Q: Why can't I just subtract 5 - 3 and get 2?

The numbers 0.5 and 0.3 represent five-tenths and three-tenths, not whole numbers 5 and 3. When you subtract in the tenths place, your result must also be in tenths: 0.2.

Q: How do I check if 0.2 is the right answer?

Use addition to check subtraction! Add your answer to what you subtracted: $ 0.2 + 0.3 = 0.5 $. Since this equals your starting number, you're correct!

Q: What if I get confused about which number to subtract from which?

In $ 0.5 - 0.3 $, the first number (0.5) is what you start with, and the second number (0.3) is what you take away. Always subtract the second from the first.

Decimal Subtraction with Tenths Place Values

$0.5-0.3=$

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations

00:00 Solution

00:03 We will use long subtraction for calculation

00:08 We will place the decimal point in the appropriate position

00:11 We will start by subtracting the corresponding smallest digits

00:14 We will place and continue to subtract and calculate

00:17 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

$0.5-0.3=$

Step-by-step solution

To solve this problem, we will perform the subtraction of two decimal numbers, $0.5$ and $0.3$ .

Align the numbers by their decimal points:
$0.5$
$-0.3$
Since the numbers are already aligned, subtract the tenths digit of $0.3$ from the tenths digit of $0.5$ :
$5 - 3 = 2$
Place this result in the tenths position of the answer, resulting in
$0.2$ .

The subtraction of $0.3$ from $0.5$ results in

$0.2$ .

Final Answer

0.2

Key Points to Remember

Essential concepts to master this topic

Alignment: Line up decimal points vertically before subtracting digits
Technique: Subtract column by column: $5 - 3 = 2$ in tenths place
Check: Add your answer to the subtrahend: $0.2 + 0.3 = 0.5$ ✓

Common Mistakes

Avoid these frequent errors

Ignoring decimal point placement
Don't subtract 5 - 3 = 2 and write just '2' as the answer! This ignores the decimal place values and gives 2 instead of 0.2. Always keep the decimal point aligned and maintain proper place value positions.

Practice Quiz

Test your knowledge with interactive questions

Determine whether the exercise is written correctly in relation to the position of the decimal point:

FAQ

Everything you need to know about this question

Why can't I just subtract 5 - 3 and get 2?

The numbers 0.5 and 0.3 represent five-tenths and three-tenths, not whole numbers 5 and 3. When you subtract in the tenths place, your result must also be in tenths: 0.2.

Do I need to add zeros to make the decimals the same length?

For this problem, both decimals already have one digit after the decimal point, so no extra zeros needed. But if you had 0.5 - 0.32, you'd write 0.50 - 0.32 to align properly.

How do I check if 0.2 is the right answer?

Use addition to check subtraction! Add your answer to what you subtracted: $0.2 + 0.3 = 0.5$ . Since this equals your starting number, you're correct!

What if I get confused about which number to subtract from which?

In $0.5 - 0.3$ , the first number (0.5) is what you start with, and the second number (0.3) is what you take away. Always subtract the second from the first.

Is there a pattern I can use for easy decimal subtraction?

Yes! When decimals have the same number of digits after the decimal point, just ignore the decimal temporarily, subtract normally (5 - 3 = 2), then put the decimal back in the same position.

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