Math Notes 2 × 5 × 27 = 1 × 15 × 18 2 + 5 + 27 = 1 + 15 + 18 213 × 624 = 312 × 426 102 × 402 = 201 × 204 936 × 213 = 639 × 312 June 14, 2010June 14, 2010 | Science & Math