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Mathematical problems of mass units
Does a math test paper weigh 9( g) at most? Fill in the quality unit, should it be mg (mg) or g (g)?

Take 70gA4 paper as an example:

70g means that the paper weighs 70g per square meter.

The size of A4 paper is 2 10*297.

Area of 0.06237m?

The weight of a piece of A4 paper is about 4.366g.

So a math paper won't be 9 mg, you have to fill in G.