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milli- prefix means: x 10-3

centi- prefix means: x 10-2

volume = mass ÷ density

area = length x width

1 ft = 30.48 cm (exactly)

thickness = volume ÷ area

= (200 mg ÷ 19.32 g/cm3) ÷ (2.4 ft x 10 ft)

= (200 x 10-3 g ÷ 19.32 g/cm3) ÷ ((2.4 x 30.48) cm x (10 x 30.48) cm)

≈ 0.000000464 cm

= (4.64 x 10-7) x (10-2) m

= 4.64 x 10-9 m

= 4.64 nm

(The nano- prefix means: x 10-9.)

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Q: If a 200 mg piece of gold density 19.32 g cm 3 is hammered into a thin sheet measuring 2.4 10 ft How might the thickness be expressed without exponential notation using an appropriate meter prefix?
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