When you can no longer break down factors. when all the numbers at the bottom are prime!
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873 x 29Since both 3 and 29 are prime numbers, the factor tree is complete.
78 6 x 13 (2x3) x 13 The numbers 2, 3, and 13 are prime numbers, so the factor tree is complete. An alternate version of a factor tree for 78 is: 78 2 x 39 2 x (3x13)
588 4 x 147 (2x2) x (3x49) (2x2) x (3 x (7x7)) Since 2, 3, and 7 are prime numbers, the factor tree is complete.
Factor tree of 40: 40 20,2 10,2,2 5,2,2,2
728 13 x 56 13 x (7x8) 13 x (7 x (2x4)) 13 x (7 x (2 x (2x2))) Since 2, 7, and 13 are prime numbers, the factor tree is complete.