The best replacement for lcm is gcf.

The best alternatives to lcm are rated as following:
★★★★★  gcf
★★★  abrsm
★★  least common multiple
★★  hcf
★★  nrv
★  gcf word problems
★  eqm
★  lumberton
  lowest common multiple
  scy
  gcd
  wos

Your alternative for lcm is not listed? Suggest!
Speaking about lcm, one probably shouldn't forget about prime factorization.

Other search terms related to lcm and their ratings are:
★★★★★ prime factorization
★★ factor tree
★★ factor trees
You have in mind a companion for lcm and it is not yet here? Propose!



Google Trends

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lcm
gcf
abrsm