GCF LCM

What is the greatest common factor (GCF) of 12 and 28?

• 3

• 6

• 2

• 4

What is the
least common multiple
 of 2 and 5? 

• 2

• 7

• 10

• 20

What is the GCF of 20 and 30?

• 5

• 2

• 10

• 20

GCF stands for...

• great calculator festival

• giant circumference fact

• grouped calculation finder

• greatest common factor

The school cafeteria serves tacos every sixth day and cheeseburgers every eight day. If tacos and cheeseburgers are both on today’s menu, how many days will it be before they are both on the menu again?

• 14 days

• 24 days

• 34 days

• 44 days

Is this question asking to find GCF or LCM?

• GCF

• LCM

Which pair of numbers has a GCF of 6?

• 3 and 18

• 6 and 12

• 12 and 24

Find the GCF of 45 and 60

• 5

• 15

• 10

• 9

Pencils come in packs of 8 and highlighters in packs of 12.  
What is the least number of pencils and highlighters you need to buy for an equal amount?
What is the least number of packages you need to buy to have an equal amount of pencils and highlighters?

• 4  2 pencil and 3 highlighter

•  48  6 pencil and 4 highlighter

• 24  3 pencil and 2 highlighter

You have 18 red legos and 24 green legos.  You need to combine them into groups of the same size with the same number of red and green legos in each group.
What is the greatest number of groups you can make?
How many red and green legos will be in each group?

•  6 groups  3 red and 4 green

•  72 groups  6 red and 3 green

•  3 groups  6 red and 8 green