Solve the Decimal Equation: Finding the Missing Number in 0.2 + ? = 0.6

Q: Why do I subtract instead of add to find the missing number?

Think of it like this: if you have 0.6 total and you already used 0.2, you need to find what's left. Subtraction tells you the remaining amount: $ 0.6 - 0.2 = 0.4 $.

Q: How do I subtract decimals like 0.6 - 0.2?

Line up the decimal points vertically and subtract normally. Think of it as 6 tenths minus 2 tenths equals 4 tenths, or 0.4.

Q: Can I solve this problem using a different method?

Yes! You can also count up from 0.2 to 0.6. Start at 0.2, then count: 0.3, 0.4, 0.5, 0.6. You moved up by 0.4!

Q: What if I get a different answer when I check my work?

If $ 0.2 + \text{your answer} $ doesn't equal 0.6, double-check your subtraction. Make sure you aligned the decimal points correctly when subtracting.

Q: Why are we working with tenths in this problem?

Numbers like 0.2 and 0.6 represent tenths. Think of 0.2 as 2 tenths and 0.6 as 6 tenths. This makes the math easier to visualize!

Decimal Addition with Missing Addends

Fill in the missing value (?):

$0.2+?=0.6$

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations

00:00 Choose the correct answer

00:03 Let's mark each option and check

00:10 Let's use long division for calculation

00:15 Let's calculate and mark

00:33 We see that the first option doesn't fit, let's move to the second

00:39 Again let's use the same method and check

01:03 We see that the second option doesn't fit, let's move to the third:

01:12 Again let's use the same method and check

01:35 We see that the third option fits, let's move to the fourth:

01:43 Again let's use the same method and check

02:06 We see that the fourth option doesn't fit

02:16 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

Fill in the missing value (?):

$0.2+?=0.6$

Step-by-step solution

To solve this problem, we will use basic subtraction:

Step 1: Restate the given equation: $0.2 + ? = 0.6$ .
Step 2: To find the missing number, subtract the known addend $0.2$ from the total $0.6$ .
Step 3: Perform the subtraction: $0.6 - 0.2 = 0.4$ .

After performing the calculation, we find that the missing value is $0.4$ . Therefore, the equation $0.2 + 0.4 = 0.6$ is correct.

Therefore, the solution to the problem is $0.4$ .

Final Answer

0.4

Key Points to Remember

Essential concepts to master this topic

Rule: To find missing addend, subtract known addend from sum
Technique: Calculate $0.6 - 0.2 = 0.4$ using column subtraction
Check: Verify $0.2 + 0.4 = 0.6$ equals original sum ✓

Common Mistakes

Avoid these frequent errors

Adding instead of subtracting to find missing value
Don't add 0.2 + 0.6 = 0.8! This gives you the wrong operation and makes the missing value too large. Always subtract the known addend from the total: 0.6 - 0.2 = 0.4.

Practice Quiz

Test your knowledge with interactive questions

$\text{0.6+0}.5=$

FAQ

Everything you need to know about this question

Why do I subtract instead of add to find the missing number?

Think of it like this: if you have 0.6 total and you already used 0.2, you need to find what's left. Subtraction tells you the remaining amount: $0.6 - 0.2 = 0.4$ .

How do I subtract decimals like 0.6 - 0.2?

Line up the decimal points vertically and subtract normally. Think of it as 6 tenths minus 2 tenths equals 4 tenths, or 0.4.

Can I solve this problem using a different method?

Yes! You can also count up from 0.2 to 0.6. Start at 0.2, then count: 0.3, 0.4, 0.5, 0.6. You moved up by 0.4!

What if I get a different answer when I check my work?

If $0.2 + \text{your answer}$ doesn't equal 0.6, double-check your subtraction. Make sure you aligned the decimal points correctly when subtracting.

Why are we working with tenths in this problem?

Numbers like 0.2 and 0.6 represent tenths. Think of 0.2 as 2 tenths and 0.6 as 6 tenths. This makes the math easier to visualize!

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