Rational and Irrational Numbers: Rational, irrational numbers as real numbers, their place in the number system. Surds and rationalisation of surds. Simplifying an expression by rationalising the ...

The population size and land area to be administered should be practically manageable for a single Grama Niladhari, Divisional Secretary or official responsible for a service to each GND. As ...

The rain was heavy for parts of last weekend in the Washington, D.C. area. Seeing it coming down in sheets, it got me thinking about how people used to live. How ...