Solve the Decimal Equation: Finding the Missing Value in 1.2 - ? = 1.1

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

00:08 Use vertical addition to calculate the problem

00:14 Insert one of the answers into the expression and proceed to calculate

00:38 We can see that the first option doesn't fit, let's move on to the second one:

00:43 Let’s apply the same method as before and proceed to check

00:49 Insert one of the answers into the expression and calculate

01:01 We can see that the second option doesn't fit, let's move on to the third one:

01:07 Once again apply the same method as before and proceed to check

01:14 Insert one of the remaining answers into the expression and calculate

01:29 We can see that the third option fits, let's move on to the fourth one:

01:33 Apply the same method as before and proceed to check

01:41 Insert the remaining answer into the expression and proceed to calculate

01:58 We can see that the fourth option doesn't fit

02:01 This is the solution

Step-by-Step Solution

To solve the problem $1.2 - ? = 1.1$ , we need to identify the unknown value represented by the question mark.

Let's go through the solution step-by-step:

Step 1: Rewrite the equation in terms of subtraction: $1.2 - x = 1.1$ , where $x$ is the missing value.
Step 2: Rearrange the equation to solve for $x$ : $x = 1.2 - 1.1$ .
Step 3: Perform the subtraction: $x = 0.1$ .
Step 4: Check the solution by substituting back into the original equation: $1.2 - 0.1 = 1.1$ , which is correct.

Therefore, the solution to the problem is that the missing value is $0.1$ .

Given the choices, the correct option is: $0.1$