5 • 2 = _ 7 • 3 = _ 3 • 9 = _ 10 : _ = 2 _ : 3 = 7 _ : 9 = 3

5 • 2 = 10 7 • 3 = 21 3 • 9 = 2710 : 5 = 2 21 : 3 = 7 27 : 9 = 3