GCF & LCM Ladder Method Challenge

What is the first prime number used in the ladder method?

• 5

• 2

• 3

• 7

Tags

CCSS.5.NBT.B.6

CCSS.6.NS.B.2

When using the ladder method, what do you do if a number is no longer divisible by the current prime number?

• Divide by 1

• Move to the next prime number

• Multiply the numbers

• Stop the process

What is the greatest common factor (GCF) of 24 and 36?

• 6

• 8

• 12

• 18

What is the least common multiple (LCM) of 24 and 36?

• 48

• 72

• 84

• 60

Which prime number is used first to divide 30 and 45 in the ladder method?

• 5

• 3

• 7

• 2

Tags

CCSS.5.NF.B.7A

CCSS.5.NF.B.7C

What is the greatest common factor (GCF) of 30 and 45?

• 5

• 10

• 15

• 20

What is the least common multiple (LCM) of 30 and 45?

• 75

• 60

• 90

• 105

Why is it important to know the GCF and LCM when working with fractions?

• To multiply fractions

• To reduce fractions and find common denominators

• To add fractions

• To divide fractions

What is the greatest common factor (GCF) of 60 and 35?

• 5

• 15

• 20

• 10

What is the least common multiple (LCM) of 60 and 35?

• 350

• 280

• 420

• 210