Question

Which is closest to 0.5?
0.4, 0.505, 0.449, 0.48 or 0.53?

Answer 1

`1)|0.5-0.4|=0.1\\ 2)|0.5-0.505|=0.005\\ 3)|0.5-0.48|=0.02\\ 4)|0.5-0.53|=0.03`

As you see the seconds difference is the smallest therefore 0.505 is closest to .0.5

Answer 2

Let us calculate the nearness of all the numbers provided
Number Nearnes
0.400 100
0.505 5
0.449 51
0.530 30

Thus 0.505 is the closest number to 0.5 in decimal terms