Math Notes 9 + 9 = 18; 9 × 9 = 81 24 + 3 = 27; 24 × 3 = 72 47 + 2 = 49; 47 × 2 = 94 497 + 2 = 499; 497 × 2 = 994 February 10, 2010February 9, 2010 | Science & Math