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The size of a calculator is approximately 10 x 15 x 1 cm = 150 cm3, therefore the mass is approximately 150 g.

using m(mass) = v(volume) x density 

The volume is calculated from the dimensions of the calculator 

estimated volume 

v= l(length) x w(width)x t(thickness) = 15cm x 10cm x1cm = 150cm3 

mass = 1 x 150 = 150g which is 102g order of magnitude 

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