Complete the Decimal Sequence: Finding Missing Terms in 1, 0.8, 0.6, ?, ?

To solve this problem, we'll look for a consistent pattern in the given sequence:

• Step 1: Identify the difference between consecutive terms.
  - From $1$ to $0.8$, the difference is $0.2$ (i.e., $1 - 0.8 = 0.2$).
  - From $0.8$ to $0.6$, the difference is $0.2$ (i.e., $0.8 - 0.6 = 0.2$).
• Step 2: Determine the next terms using this difference.
  - The next term after $0.6$ will be $0.6 - 0.2 = 0.4$.
  - The term after that will be $0.4 - 0.2 = 0.2$.

Therefore, the sequence $1, 0.8, 0.6, ?, ?$ continues as $0.4, 0.2$.

The correct answer is $0.4, 0.2$, which corresponds to choice 4.