275
5 55
5 5 11
275= 5 x 5 x 11
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The HCF of 275 is 275. But it's a factor as opposed to a common factor because there's only one number.
550 = 2 x 275 = 2 x 5 x 55 = 2 x 5 x 5 x 11
Factor tree of 40: 40 20,2 10,2,2 5,2,2,2
Here is a factor tree of eight: 8 / \ 4 2 / \ 2 2
873 x 29Since both 3 and 29 are prime numbers, the factor tree is complete.