Finding the Least Common Multiple Efficiently

What is a multiple of 3?

• 8

• 6

• 5

• 7

Tags

CCSS.4.OA.B.4

Which of the following is a multiple of 4?

• 14

• 12

• 10

• 9

What is the least common multiple (LCM) of 3 and 4?

• 8

• 10

• 6

• 12

What is the LCM of 3 and 5?

• 15

• 12

• 10

• 20

What is the LCM of 4 and 5?

• 25

• 15

• 18

• 20

What is the LCM of 6 and 9?

• 18

• 27

• 36

• 54

What is the first step in finding the LCM of larger numbers?

• Find the prime factorization

• Subtract the numbers

• Add the numbers

• Divide the numbers

What is the LCM of 12 and 80?

• 240

• 120

• 160

• 200

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Why might we want to find the LCM of two fractions?

• To add them

• To multiply them

• To subtract them

• To compare their sizes

What is the LCM of 3 and 4, used to compare 1/3 and 1/4?

• 6

• 10

• 8

• 12