How to find the area of-:

a) 13  1/2

b0 Length =9cm, Breadth =1m 30cm 

I could not interpret your first query. Please be a little specific so that I could provide you meaningful help.

b.

Length of the rectangle = 9 cm

Breadth of the rectangle = 1m 30cm = 100cm + 30 cm = 130 cm

Area of the rectangle

= Length of the rectangle × Breadth of the rectangle

= 9 cm × 130 cm

= 1170 cm2