Multipliplying multiples of ten by other multiples of ten (up to 100)

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30 x 40
50 x 70
20 x 40
60 x 70
30 x 60
90 x 70
80 x 80
50 x 10
30 x 90
70 x 70
40 x 50
60 x 60
90 x 80
50 x 90
20 x 60
80 x 40
90 x 60
50 x 50
60 x 80
40 x 30
70 x 60
70 x 40
70 x 80
20 x 90
60 x 100
80 x 100
50 x 100
40 x 40
90 x 40
60 x 40