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

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

• Step 1: Begin with the equation $? + 0.5 = 0.7$.
• Step 2: To find '?', subtract 0.5 from both sides of the equation.
• Step 3: Calculate $0.7 - 0.5$.

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.