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Divide 42 by 2 to give you 21.
To find half of 84, you divide 84 by 2, which equals 42. To find half of 42, you divide 42 by 2 again, which equals 21. Therefore, a half of a half of 84 is 21.
1 2 3 6 7 14 21 42.
No.86 does not divide by 3...The GCF = 2
Please rephrase question.