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.
19 is not a factor of 81. Factors of 81 are 1, 3, 9, 27, and 81
9x9=81. Proving that one of the factor trees for 81 is 9xp.
81 27,3 9,3,3 3,3,3,3
81 27,3 9,3,3 3,3,3,3
81 27,3 9,3,3 3,3,3,3
81 27,3 9,3,3 3,3,3,3
81 27,3 9,3,3 3,3,3,3
81 27,3 9,3,3 3,3,3,3
45 15,3 5,3,3 81 27,3 9,3,3 3,3,3,3
51 3,17 81 9,9 3,3,9 3,3,3,3 The GCF is 3.
The greatest common factor for the numbers 27 and 81 are 27.
A factor tree of number is (I think) the numbers that multiply together to form a product. They are prime numbers, too.
The factors of 81 are 1, 3, 9, 27, and 81. There is no common factor for a single number; a common factor is a factor of two or more given numbers. The Greatest Common Factor (GCF) is the largest factor common to two or more given numbers. For example, 17 is the GCF of 34, 51, and 102 because it is the largest number that is a factor common to all three numbers.