Well, darling, grab yourself a tape measure with markings in inches and fractions of an inch. Locate the 3/4 inch mark, which is equivalent to 0.75. Then, eyeball the space between 3/4 and 1 inch, split it in half, and voila, you've got yourself 0.80 inches. Easy peasy lemon squeezy!
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The answer depends on the units used for the tape measure.
Half of 21.25 is 10.625 - whether on a tape measure or a calculator or anywhere else.
Use a tape measure!
A yardstick is rigid - a tape measure is flexible.
A tape measure.