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Greatest common factor (GCF) of 42 and 63 is 21
capsasha2

Answer:

21

Step-by-step explanation:

List the factors of 63 and 42:

  1. 63: 1, 3, 7, 9, 21, 63
  2. 42: 1, 2, 3, 6, 7, 14, 21, 42

Find the greatest factor listed in both lists:

  1. 21 in the greatest in both lists, so that is the answer (21 is the GCF of 63 and 42)

I hope this helps!

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