class 9 maths : NUMBER SYSTEM

1. find four rational numbers between [tex]\frac{1}{2}[/tex] and [tex]\frac{3}{5}[/tex].
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2. Express 0.16 in the form p/q where p and q are integers and q not equal to zero.
3. Represent [tex]\sqrt{6.4}[/tex] on the number line.
4. find the values of a and b if [tex]\frac{3+\sqrt{2} }{3-\sqrt{2} } =a+b\sqrt{2}[/tex].

steps needed..