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4 kilograms represents the MASS of the entity that it refers to.
If the question refers to 2" x 4" then there are 2 x 4 = 8 sq in. If the question refers to 2' x 4' (i.e. the lengths are in feet) then there are : 2 x 12 x 4 x 12 = 1152 sq in
That refers to addition, subtraction, multiplication, and division.
It depends on whether the 4x4 refers to 4 ft by 4 ft, 4 inches x 4 inches or some other unit.
4 kilograms is 4000 grams. the prefix "kilo" refers to thousand and the post-fix refers to gram hence 4000 grams! isn't the metric system so easy, everything is in factors of 10, 100 or 1000.