gcf and lcm

Joanne is campaigning for class president and plans to distribute some campaign materials: 20 flyers and 16 buttons. She wants each classroom to receive an identical set of campaign materials, without having any materials left over. What is the greatest number of classrooms Joanne can distribute materials to?

• LCM, 4 classrooms

• GCF, 8 classrooms

• GCF, 4 classrooms

• LCM, 80 classrooms

Matthew goes hiking every 2 days and swimming every 6 days, He did both kinds of exercise today. How many days from now will he go both hiking and swimming again?

• GCF, 2 days

• LCM, 12 days

• GCF, 12 days

• LCM, 13 days

Is this question asking to find GCF or LCM?

• GCF
• LCM

At the gym, Hillary swims every 6 days, runs every 4 days and cycles every 16 days. If she did all three activities today, in how many days will she do all three activities on the same day? (hint LCM)

• 16

• 24

• 48

• 32

What is 105 as a product of prime factors?

• 7x5x3

• 11x5x3

• 7x5x2x1

• 7x5x3x2

 Find the GCF of each set of numbers. 
28, 42, 56

• 14
• 4
• 7
• 8

Find the LCM of each set of numbers. 
5, 10, 15 

• 50
• 30
• 90
• 150

You have a set of 12 hearts, 16 diamonds, and 20 clubs that need to be put into equal groups.  Each group must be made up of the same number of hearts, diamonds, and clubs.  What is the greatest number of groups that can be made?

• 6 groups
• 2 groups
• 4 groups