12aleksandrowic 12aleksandrowic

30-09-2014
Mathematics

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what is i hcf of 21 and 28

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mariamikayla mariamikayla

30-09-2014

[tex]21|3 \\ 7 \ |7 \\ 1 \\\\ 21=3*7 \\\\ 28|2 \\ 14|2 \\ 7 \ |7 \\ 1 \\\\ 28=2^2*7 \\\\ H.C.F(21;28)\to\boxed{7}[/tex]

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30-09-2014

The factors of 21 are 1, 3, 7, and 21 .

The factors of 28 are 1, 2, 4, 7, 14, and 28 .

The factors common to both numbers are 1 and 7 .

The greatest one is 7.

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