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A measured number is not estimated. It is measured to the accuracy of the tool being used, though all tools have a certain tolerance and the last digit would be the least accurate.
mass is measured with a balance comparing an unknown mass with an object of known mass. weight is not measeured with the same tools as mass.
The operation in which we measure our desired vertical length and horizontal length with measuring tools (for example;scale,tri-square,vernier calliper, screw gauge,etc. ) and mark that measured vertical length and horizontal length by marking tools for example;scriber, etc. on our metal piece, is called measuring and marking operation.
They were small stones or pebbles - called calculus (pl = calculi).
Centimetres. A metrestick to measure the cats length but a cat is not going to take kindly to being measured. So among the tools you may wish to consider a tranquiliser.