The next 2 terms would be 1.25 and 0.625, because 20 divided by 2 equals 10, and 10 divided by 2 equals 5, and 5 divided by 2 is 2.5, and 2.5 divided by 2 is 1.25, and so on. So what I'm saying is that the two terms is 1.25 and 0.625 because you divided every number by 2.
hope this help