Question

Compare the number of prime factors of $72$ and $64$ using factor tree.

• A. $72$ has more prime factors then $64$
• B. $64$ has more prime factor then $72$
• C. Both have same number of prime factors

Answer 1

The correct option is A $72$ has more prime factors then $64$

Concept: If factor of a number is a prime number, then the factor is called prime factor.

Factor tree for $72$:


Factors of $72$ are $1,2,3,4,6,8,9,12,18,24,36,72$

Prime factors of 72 are 2 and 3.

Factor tree for $64$:


​​​​​​​Factors of $64$ are 1, 2, 4, 8, 16, 32, 64
Prime factor of 64 is 2.