Solve the Decimal Equation: Finding the Missing Value in ? + 2.4 = 4.5

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 identify which of them is correct

00:10 Use vertical addition to calculate the problem

00:17 Insert one of the answers into the expression and proceed to calculate

00:31 We can see that the first option is not suitable, let's move on to the second one

00:36 Let's apply the same method as before and proceed to check

00:45 Insert one of the answers into the expression and calculate

01:00 We can see that the second option is suitable, let's move on to the third one

01:06 Once again apply the same method as before and proceed to check

01:15 Insert one of the remaining answers into the expression and calculate

01:29 We can see that the third option is not suitable, let's move to the fourth one:

01:36 Apply the same method as before and proceed to check

01:43 Insert the remaining answer into the expression and proceed to calculate

01:58 We can see that the fourth option is not suitable

02:04 This is the solution

Step-by-Step Solution

Let's solve the problem step by step:

Step 1: Identify the equation.
The equation is $? + 2.4 = 4.5$ .
Step 2: Isolate the missing value.
To find the missing number, subtract 2.4 from both sides.
Step 3: Perform the subtraction.
The calculation is $4.5 - 2.4$ .
Step 4: Calculate the difference.
Start with the tenths place: $5 - 4 = 1$ in the tenths place.
Subtract the whole numbers: $4 - 2 = 2$ . Thus, the complete subtraction is $2.1$ .

Therefore, the missing value that satisfies the equation $? + 2.4 = 4.5$ is $2.1$ .