Make sure you put it in my hand. Why did you throw it on the floor when I had my hand out?
この場合、次のような言い方ができますよ。
ーMake sure you put it in my hand. Why did you throw it on the floor when I had my hand out?
「ちゃんと手に渡して。手を出してるのに、なんで床に捨てるの?」
to throw ... on the floor「…を床に捨てる」
to have one's hand out「手を出す」
ご参考まで!