Finding the greatest common factor and the least common multiple

(1) Because 42 △ 14 = 3, that is, 42 and 14 are multiple, the greatest common factor of 42 and 14 is 14, and the least common multiple is 42; (2) 12 = 2 × 2 × 3, 18 = 2 × 3 × 3, so the greatest common factor of 12 and 18 is 2 × 3 = 6, and the least common multiple is 2 × 2 × 3 × 3 = 36

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