LCM and GCf Quiz

A factor of a number is always greater than the number

All even numbers are composite.

One hundred seventeen is a prime number.

Find the prime factorization of 420 using factor trees.  Write your final answer using exponents.

Find the GCF of 70 and 455

(a)  

Find the GCF of 12, 18, and 24

(a)  

Find the GCF of  $8x^4y^{6\ }and\ 20x^5y$  

 $\ Find\ the\ LCM\ of15x^2\ and\ 35y^5$  

I go to the gym every eight days and the grocery store every fourteen days. If I went to both today, how many days until I got to both again on the same day?

There are 75 seventh graders and 60 sixth graders going on the field trip. I want to divide them into groups with the same amount of students in each group with no students left over. What is the largest number of students you can have in each group, with no students left over?