18
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In the number sentence 3 x 6, 3 and 6 are factors of 18. 3 is prime. The prime factorization of 18 is 2 x 3 x 3.
If for every 2 there is 3, then for every 12 it is 18.you simply divide 12 by 2 then multiply that by 3 and 3x6 is 18.
9x8
The GCF of 12, 18, and 27 is 3 The factors of 12 = 1x12, 2x6, 3x4 = 1, 2, 3, 4, 6, and 12 The factors of 18 = 1x18, 2x9, 3x6 = 1, 2, 3, 6, 9, and 18 The factors of 27 = 1x27, 3x9 = 1, 3, 9, and 27 The GCF is 3.
3 is the GCF of 12, 18, and 21. 3x4=12 3x6=18 3x7=21 3 is the GCF of 12, 18, and 21.