Find the square of $56$ using the diagonal method

Find the square of $32$ using the diagonal method:

Find the square of $64$ using the diagonal method:

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 $\mathit{(}x\mathit{+}y{\mathit{)}}^{\mathit{2}}\mathit{=}{x}^{\mathit{2}}\mathit{+}\mathit{2}xy\mathit{+}{y}^{\mathit{2}}\mathit{ }\mathrm{or}\mathit{ }\mathit{(}x\mathit{-}y{\mathit{)}}^{\mathit{2}}\mathit{=}{x}^{\mathit{2}}\mathit{-}\mathit{2}xy\mathit{+}{y}^{\mathit{2}}$