Square power excercises till 20

Calculate:

The number of examples:
Numerical difficulty:
Range of values:
Multiplicity:

22	+	42	=
22	+	12	=
12	+	42	=
42	+	32	=
32	+	32	=
42	+	22	=
32	+	42	=
92	+	12	=
22	+	72	=
52	+	52	=