GCF & LCM

What does GCF stand for?

• Good Common Factor
• Gross Common Fraction
• Great Calculated Factor
• Greatest Common Factor

Tags

CCSS.6.NS.B.4

What does LCM stand for?

• Largest Common Multiple
• Least Common Multiple
• Lowest Common Multiple
• Lowest Common Minimum

Tags

CCSS.6.NS.B.4

True or False: GCFs continue infinitely.

• False
• Depends on the weather
• Sometimes
• True

Answer explanation

Greatest Common Factors (GCFs) come in sets, and do not continue infinitely. A factor is a number that can be multiplied into another number to get another number. One way to remember is factor = multiplication facts.

Example problem:

Q: Find the GCF of 18 and 24.

A: 6_

6 x 3 = 18

6 x 4 = 24

Tags

CCSS.6.NS.B.4

True or False: LCMs continue infinitely.

• Depends on the number
• True
• False
• Sometimes

Answer explanation

Least Common Multiples (LCMs) continue infinitely. A multiple is a number that is multiplied by the number in the problem. One way to remember is multiple = multiply it.

Example problem:

Q: Find the LCM of 18 and 24.

A: 72________________

24 x 3 = 72

18 x 4 = 72

Tags

CCSS.6.NS.B.4

What is the GCF of 20 and 14?

Answer explanation

Tags

CCSS.6.NS.B.4

What is the LCM of 11 and 19?

Answer explanation

Tags

CCSS.6.NS.B.4

What is the difference between the LCM and GCF of 40 and 24?

Answer explanation

Tags

CCSS.6.NS.B.4

What is the sum of the GCF and LCM of 27 and 54?

Answer explanation

Tags

CCSS.6.NS.B.4