Solve the Decimal Equation: Finding the Missing Number in 0.2 + ? = 0.6

To solve this problem, we will use basic subtraction:

• Step 1: Restate the given equation: $0.2 + ? = 0.6$.
• Step 2: To find the missing number, subtract the known addend $0.2$ from the total $0.6$.
• Step 3: Perform the subtraction: $0.6 - 0.2 = 0.4$.

After performing the calculation, we find that the missing value is $0.4$. Therefore, the equation $0.2 + 0.4 = 0.6$ is correct.

Therefore, the solution to the problem is $0.4$.