Solve the Decimal Equation: Finding the Missing Value in 0.5 - ? = 0.2

Fill in the missing value (?):

0.5−?=0.2 0.5-?=0.2

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Identify which of the following answers is correct
00:03 Insert each of the potential answers into the expression in order to verify which of them is correct
00:07 Use vertical addition to calculate the problem
00:13 Insert one of the answers into the expression and proceed to calculate
00:25 We can see that the first option doesn't fit, let's move on to the second one
00:33 Let’s apply the same method as before and proceed to check
00:40 Insert one of the answers into the expression and calculate
00:55 We can see that the second option doesn't fit, let's move on to the third one:
01:02 Once again apply the same method as before and proceed to check
01:10 Insert one of the remaining answers into the expression and calculate
01:26 We can see that the third option fits, let's move on to the fourth one:
01:31 Insert one of the remaining answers into the expression and calculate
01:37 Insert the remaining answer into the expression and proceed to calculate
01:50 We can see that the fourth option doesn't fit
01:54 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Fill in the missing value (?):

0.5−?=0.2 0.5-?=0.2

2

Step-by-step solution

To solve the problem 0.5−?=0.2 0.5 - ? = 0.2 , let's proceed with the following steps:

  • Step 1: Begin with the equation: 0.5−?=0.2 0.5 - ? = 0.2 .
  • Step 2: To isolate '?', add 0.2 to both sides of the equation. This gives us:

0.5−?+0.2=0.2+0.2 0.5 - ? + 0.2 = 0.2 + 0.2 .

  • Step 3: Simplify the equation:

0.5=?+0.2 0.5 = ? + 0.2 .

  • Step 4: Isolate '?' by subtracting 0.2 from 0.5:

?=0.5−0.2 ? = 0.5 - 0.2 .

  • Step 5: Perform the subtraction:

?=0.3 ? = 0.3 .

Therefore, the solution to the problem is 0.3\boxed{0.3}. This matches with choice 3 of the given options.

3

Final Answer

0.3

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