There are about 300 grams of primary school math books and about 600 grams of middle school math books.

Gram, the unit of mass, symbol G. One gram is the mass of18×140744812 atoms, and the weight of one gram is about the weight of one cubic centimeter of water at room temperature.

Extended data:

G is the unit of mass, one thousandth of a kilogram (kg), and one gram is the mass of18×14074481c-12 atoms.

Correlation transformation:

1 ton = 1, 000,000 grams (one million grams)

1 kg (1 kg) = 1 1,000 g (1 kg)

1 kg = 500g (1 g = 0.002kg)

1 mg = 0.00 1 g (1 g = 1000 mg)

1 μ g = 0.0000 1 μ g (1 μ g = 1000000 μ g)

1 nanogram = 0.0000000 1 gram (1 gram = 10000000 nanogram)

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