490. The unit of weight is the gram, which is equal to the weight of a cubic centimeter of distilled water at its greatest density.

10 milligrams (mg) = 1 centigram (cg).

10 centigrams = 1 decigram (dg).

491. A cubic centimeter of water weighs a gram.

492. A cubic decimeter of water weighs a kilogram.

493. A liter of water weighs a kilogram.

494. A cubic meter of water weighs a ton.

495. A kiloliter of water weighs a ton.

TO THE TEACHER. - Show pupils that reduction ascending and reduction descending in the metric system are performed by moving the decimal point, to the right in reduction descending and to the left in reduction ascending. In linear measures, measures of capacity, and weight, the decimal point is moved one place. In surface measures the decimal point is moved two places. In volume measures the decimal point is moved three places. Show also that all operations with metric numbers are performed like similar operations in decimals. Give examples in the various tables in reduction ascending and descending, addition, subtraction, multiplication, and division.

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