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

Video Solution

Solution Steps

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 Solution

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

$0.5 - ? + 0.2 = 0.2 + 0.2$ .

$0.5 = ? + 0.2$ .

$? = 0.5 - 0.2$ .

$? = 0.3$ .

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