Final answer:
To determine which number is closest to a half, convert each number to a decimal and compare the values. 0.458 is the closest to 0.5.
Step-by-step explanation:
To determine which number is closest to a half, we can compare the decimal representation and the fraction representation of each number. Let's convert each number to a decimal and see:
0.458 = 45.8%, 11/20
= 0.55, 0.543
= 54.3%, 23/50
= 0.46
Comparing the decimal values, we can see that 0.458 is the closest to 0.5.