Solve the Equation: Finding the Missing Number in ? - 4.3 = 8.2

Question

Fill in the missing value (?):

$?-4.3=8.2$

00:00 Choose the correct answer

00:04 Let's write down each option and check

00:17 We'll use long subtraction for calculation

00:24 Let's calculate and substitute

00:47 We see that the first option doesn't fit, let's move to the second

00:54 Again we'll use the same method and check

01:06 Let's calculate and substitute

01:40 We see that the second option doesn't fit, let's move to the third

01:47 Again we'll use the same method and check

01:52 Let's calculate and substitute

02:29 We see that the third option fits, let's move to the fourth

02:37 Again we'll use the same method and check

02:44 Let's calculate and substitute

03:13 We see that the fourth option doesn't fit

03:21 And this is the solution to the question

To solve the equation $? - 4.3 = 8.2$ , we will isolate the variable $?$ .

Step 1: Add 4.3 to both sides of the equation to eliminate the subtraction from the left-hand side:

$\begin{aligned} ? - 4.3 + 4.3 &= 8.2 + 4.3 \\ ? &= 12.5 \end{aligned}$

Therefore, the solution to the problem is $\boxed{12.5}$ .

12.5