Half of 21.25 is 10.625 - whether on a tape measure or a calculator or anywhere else.
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Half of 5 ft on a tape measure would be 2.5 ft. This is because half of any number is obtained by dividing it by 2. In this case, dividing 5 ft by 2 gives us 2.5 ft. So, half of 5 ft on a tape measure is 2.5 ft.
The answer depends on the units used for the tape measure.
Use a tape measure!
A yardstick is rigid - a tape measure is flexible.
A tape measure.