Calculate.

a) [[$ \sqrt {1} $]] =

b) [[$ \sqrt {0} $]] =

c) [[$ \sqrt {49} $]] =

d) [[$ \sqrt {36} $]] =

e) [[$ \sqrt {100} $]] =

f) [[$ \sqrt {64} $]] =

g) [[$ \sqrt {81} $]] =

h) [[$ \sqrt {121} $]] =