Solve the Decimal Equation: Finding the Missing Number in 0.1 + ? = 0.4

Fill in the missing values (?):

0.1+?=0.4 0.1+?=0.4

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:07 Let's find the correct answer from the options.
00:11 We'll test each one by placing and checking carefully.
00:18 Using long multiplication for accurate calculation.
00:24 Let's compute and see if it fits the question.
00:36 The first option doesn't work, so let's try the second one.
00:48 We'll apply the same method and examine it closely.
01:07 The second option isn't correct, let's look at the third.
01:14 Again, we'll use the same approach to verify.
01:35 The third option fits, let's check the fourth for certainty.
01:39 We'll use the same method to inspect the fourth option.
02:03 The fourth one doesn't fit either.
02:11 And that's how we find the correct answer!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Fill in the missing values (?):

0.1+?=0.4 0.1+?=0.4

2

Step-by-step solution

To solve this problem, we need to find what number, when added to 0.10.1, results in 0.40.4. We can solve this using simple arithmetic operations as follows:

  • Step 1: Understand that the equation provided is 0.1+?=0.40.1 + ? = 0.4.
  • Step 2: To find the missing value ??, we need to rearrange the equation by isolating ?? on one side: ?=0.4−0.1? = 0.4 - 0.1.
  • Step 3: Conduct the subtraction: 0.4−0.1=0.30.4 - 0.1 = 0.3.

Therefore, the number that needs to be added to 0.10.1 to equal 0.40.4 is 0.30.3.

Reviewing the provided multiple-choice options, the correct choice is the third option: 0.30.3.

3

Final Answer

0.3

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