To write twenty and one half inches, you would write it as "20 1/2 inches" or "20.5 inches." The fraction 1/2 can be converted to a decimal by dividing the numerator (1) by the denominator (2), which equals 0.5. Therefore, you can also express it as a decimal measurement, such as 20.5 inches.
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twenty and two and a half
21.21
one thousand twenty and twenty-five hundredths is written 1,020.25
21 inches equals how many feet?
0.021