Halfway between two numbers is the same as their average. The average of 0.2 and 0.3 is (0.2 + 0.3) / 2 = (0.5 / 2) = 0.25 Check: The distance between 0.25 and 0.2 is (0.25 - 0.2) = 0.05 The distance between 0.3 and 0.25 is (0.3 - 0.25) = 0.05 The distances are the same. So 0.25 is exactly halfway between 0.2 and 0.3.
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There is no such number because decimals are infinitely dense. That is, between any two decimals, there are infinitely many decimals.
.5+.5=1 .5*4=2 2+(.5)= 2.5
You add the two numbers, and divide the result by 2.
Decimal numbers are infinitely dense throughout their domain. That means that between any two decimals there are infinitely many decimals. One consequence is that there is no smallest or first such number.
two sevenths as decimal (2/7) = 0.29