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To simplify and write in scientific notation, we need to move the decimal point until there is only one non-zero digit to the left of the decimal.
0.5(8 × 10^5) can be written as 4 × 10^5.
8 × 55 can be simplified to 440.
8 × 5.5 can be simplified to 44.
4 × 55 can be simplified to 220.
4 × 5.5 can be simplified to 22.
8 × 10^5 remains the same.
4 × 10^5 remains the same.