3 years ago

What is i hcf of 21 and 28

Mathematics

2 answers:

olchik [2.2K]3 years ago

7 0

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

alexira [117]3 years ago

5 0

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 <em> 7</em>.

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