Solve the Decimal Equation: Finding the Missing Value in ? + 0.5 = 0.7

Question

Fill in the missing value (?):

$?+0.5=0.7$

00:00 Identify which of the following answers is correct

00:03 Insert each of the potential answers into the expression in order to identify which of them is correct

00:08 Use vertical addition to calculate the problem

00:12 Insert one of the answers into the expression and proceed to calculate

00:25 We can see that the first option is not suitable, let's move on to the second one:

00:31 Let's apply the same method as before and proceed to check

00:37 Insert one of the answers into the expression and calculate

00:53 We can see that the second option is suitable, let's move to the third one

01:00 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

01:24 We can see that the third option is not suitable, let's move to the fourth one:

01:31 Apply the same method as before and proceed to check

01:37 Insert the remaining answer into the expression and proceed to calculate

01:53 We can see that the fourth option is not suitable

02:00 This is the solution

To solve the equation $? + 0.5 = 0.7$ , we need to isolate '?'.

Performing the subtraction:
$0.7 - 0.5 = 0.2$

Therefore, the value of '?' that makes the equation true is $0.2$ .

This corresponds to choice 2 in the options provided.

0.2