Choose the appropriate unit for measuring the thickness of a coin:

centimetre

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millimetre

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metre

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kilometre

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Solution

The correct option is B millimetre
The appropriate unit for measuring the thickness of a coin is millimetre which is a sub-multiple of metre because the thickness of a coin is usually smaller than $1 cm$ .
It can be measured in metre, centimetre, and kilometre as well but millimetre is more convenient and accurate compared to the others as they are too big that the magnitude of measurement would end up being quite less than $0.1$ .

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CHOOSING APPROPRIATE UNITS

Match each value with the most appropriate unit of measurement.

Column 1	Column 2
height of a sky scrapper: $2.6 \times 10^{2}$	inches
distance between two asteroids: $2.5 \times 10^{5}$	millimeter
depth of a bath tub: $1.6 \times 10^{1}$	miles
length of a memory chip: $7.8 \times 10^{0}$	meters

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