Stacking Cubes 43 + 183 + 333 = 41833 163 + 503 + 333 = 165033 223 + 183 + 593 = 221859 443 + 463 + 643 = 444664 483 + 723 + 153 = 487215 983 + 283 + 273 = 982827 February 10, 2011February 9, 2011 | Science & Math