Find the square of $91$ using the easy method.

Find the square of $98$ using the easy method.

Find the square of$106$ using the easy method.

Find the square of $195$ using the easy method.

Find the square of $505$ using the easy method:

Find the square of $199$ using either $\mathit{(}x\mathit{+}y{\mathit{)}}^{\mathit{2}}\mathit{=}{x}^{\mathit{2}}\mathit{+}\mathit{2}xy\mathit{+}{y}^{\mathit{2}}\mathit{ }\mathrm{or}\mathit{ }\mathit{(}x\mathit{-}y{\mathit{)}}^{\mathit{2}}\mathit{=}{x}^{\mathit{2}}\mathit{-}\mathit{2}xy\mathit{+}{y}^{\mathit{2}}$

Find the square of $103$ using either $(x+y{)}^2=x^2+2xy+y^2 \mathrm{or} (\mathrm{x}-\mathrm{y}{)}^2={\mathrm{x}}^2-2\mathrm{xy}+{\mathrm{y}}^2$

Find the square of $202$ using either $(x+y{)}^2=x^2+2xy+y^2 or\mathit{ }\mathit{(}x\mathit{-}y{\mathit{)}}^{\mathit{2}}\mathit{=}{x}^{\mathit{2}}\mathit{-}\mathit{2}xy\mathit{+}{y}^{\mathit{2}}$

Find the square of $395$ using either $(x+y{)}^2=x^2+2xy+y^2 or\mathit{ }\mathit{(}x\mathit{-}y{\mathit{)}}^{\mathit{2}}\mathit{=}{x}^{\mathit{2}}\mathit{-}\mathit{2}xy\mathit{+}{y}^{\mathit{2}}\mathit{ }$