The best replacement for gcf is lcm.

The best alternatives to gcf are rated as following:
★★★★★  lcm
★★★★★  greatest common factor
★★  gcd
★  lcm worksheet
  hcf

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Speaking about gcf, one probably shouldn't forget about prime factorization.

Other search terms related to gcf and their ratings are:
★★★★★ prime factorization
★★★★★ polynomials
★★ factoring
factor tree
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gcf
lcm
greatest common factor