252
28 x 9
7 x 4 x 3 x 3
7 x 2 x 2 x 3 x 3
or
252
12 x 21
3 x 4 x 7 x 3
3 x 2 x 2 x 7 x 3
or
252
14 x 42
7 x 2 x 21 x 2
7 x 2 x 7 x 3 x 2
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252 126,2 63,2,2 21,3,2,2 7,3,3,2,2
15,3 3,5,3
27 3,9 3,3,3
9x9=81. Proving that one of the factor trees for 81 is 9xp.
441 / 252 = 1 r 189 252 / 189 = 1 r 63 189 / 63 = 3 r 0 The hcf of 441 and 252 is 63