Final Cover - For Printing

19. Addition in metric measures
    As the metric measures are based on powers of ten, addition and subtraction in metric
    system is just like addition and subtraction in number system.

Eg. : Add : 6m 3 dm 5 cm ; 5m 4dm 5 cm and 5m 3 dm 2 cm

m dm cm

6 3 5
5 4 5
5 3 2

17 1 2

That is, the result is 17m 1 dm 9 cm

The idea may be explained to the child that the changes in higher values are in terms

of tens and therefore, the additions is just like regular additions.

The concept of borrowing numbers from the higher columns is similar to that of

abacus and therefore use of abacus during this lesson will enhance the learning skills

of the child.

20. Subtraction in metric measures
    The process of subtraction in metric system is also just similar to addition.

Eg. : Subtract 5 g 4 dg 3 cg from 7 g 5 dg 6 cg

g dg cg

7 5 6

5 4 3

2 1 3

Therefore the difference between the two quantities is 2 g 1 dg 3 cg