Multiples
The first three multiples of 2
What are 2, 4, 6?
All the factors of 6
What are 1, 2, 3, 6?
LCM of 2 and 4
What is 4?
GCF of 4 and 6
What is 2?
Sara has 12 strawberries. She wants to put them into equal groups. Name one way she can group them.
What is 2 groups of 6, 3 groups of 4, 4 groups of 3, or 6 groups of 2?
True or false: 15 is a multiple of 3
What is true? (3 x 5 = 15)
True or false: 4 is a factor of 15
What is false? (4 does not divide evenly into 15)
LCM of 3 and 5
What is 15?
GCF of 10 and 15
What is 5?
A train comes every 4 minutes. A bus comes every 6 minutes. If both arrive at 10:00 AM, what is the next time they will arrive together? (Hint: Find the LCM)
What is 10:12 AM?
Name two multiples of 7
What are 7, 14, 21, 28, 35... (any two)
Name two factors of 24
What are 1, 2, 3, 4, 6, 8, 12, 24 (any two)
LCM of 4 and 6
What is 12?
GCF of 16 and 24
What is 8?
John has 12 red pens and 18 blue pens. He wants to make gift bags with the same number of red pens and the same number of blue pens in each bag. What is the greatest number of bags he can make? (Hint: Find the GCF)
What is 6 bags?
Is 24 a multiple of 5? Explain why or why not
What is no? Because 5 x 4 = 20 and 5 x 5 = 25. (No whole number multiplied by 5 equals 24)
Is 9 a factor of 27? Explain
What is yes? Because 9 x 3 = 27
LCM of 6 and 9
What is 18?
GCF of 14 and 21
What is 7?
Two numbers have a GCF of 3 and an LCM of 18. One number is 6. What is the other number?
What is 9? (GCF of 6 and 9 is 3; LCM of 6 and 9 is 18)
Find the least common multiple (LCM) of 2 and 3
What is 6?
Find the greatest common factor (GCF) of 8 and 12
What is 4?
LCM of 4, 5, and 10
What is 20?
GCF of 18 and 27
What is 9?
A teacher has 24 students. She wants to divide them into groups for a project. The number of groups must be a factor of 24, and each group must have more than 3 students but less than 12. How many different ways can she group the students?
What are 3 ways? (4 groups of 6, 6 groups of 4, 8 groups of 3 – but 3 students per group is not more than 3, so only 4 groups of 6 and 6 groups of 4 = 2 ways)