Exploring Least Common Multiples in 5th Grade Math

This video tutorial by Mr. J covers the concept of least common multiples (LCM), which is crucial for understanding fractions in fifth-grade math. The video provides step-by-step instructions on finding the LCM for different sets of numbers, including 3 and 4, 9 and 6, 12 and 9, 5 and 20, and 8, 3, and 6. Mr. J emphasizes the importance of writing out multiples and finding the smallest common multiple. The tutorial concludes with a mastery check for students to practice independently.

Why are least common multiples important in fifth-grade math?

• They help in solving addition problems.

• They are used in fraction operations.

• They are needed for geometry.

• They are used in measuring angles.

What does the acronym LCM stand for?

• Least Common Multiple

• Lowest Common Multiple

• Least Common Measurement

• Lowest Common Measurement

What is the least common multiple of 3 and 4?

• 15

• 12

• 9

• 6

Which of the following is a multiple of 9?

• 18

• 20

• 22

• 24

Tags

CCSS.4.OA.B.4

What is the least common multiple of 9 and 6?

• 24

• 30

• 18

• 12

If you don't find a common multiple after listing five multiples, what should you do?

• Stop and guess the answer.

• Ask for help.

• Continue listing more multiples.

• Change the numbers.

What is the least common multiple of 12 and 9?

• 36

• 42

• 30

• 24

Can the least common multiple be one of the original numbers?

• Yes, sometimes.

• No, never.

• No, only if they are prime.

• Yes, always.

What is the least common multiple of 8, 3, and 6?

• 24

• 30

• 18

• 36

Where can you find the link to the mastery check?

• In the video title.

• In the comments section.

• At the end of the video.

• In the video description.