The factors of 81 are: 1, 3, 9, 27, 81.
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9x9=81. Proving that one of the factor trees for 81 is 9xp.
27 and 81 are a possibility. Also numbers like 5 and 10, 20 and 40.
873 x 29Since both 3 and 29 are prime numbers, the factor tree is complete.
3x7=21 3 and 7 are prime numbers, so 3x7 is the factor tree of the number 21.
All the numbers are prime