Understanding Least Common Multiple (LCM)

The video introduces a simpler method for finding the least common multiple (LCM) by listing multiples of each number and identifying the first common multiple. The method is demonstrated using the numbers 15 and 20, showing that 60 is their LCM. The video concludes with a recap of the method.

What is the main focus of the video tutorial?

• Finding the greatest common divisor

• Solving quadratic equations

• Understanding fractions

• Finding the least common multiple

What is the first step in the method described for finding the LCM?

• Finding the greatest common factor

• Dividing the numbers

• Subtracting the numbers

• Listing all multiples of each number

How do you identify the least common multiple from the lists?

• By finding the largest number

• By finding the first common multiple

• By adding all numbers

• By subtracting the smallest number

Tags

CCSS.4.OA.C.5

What is the arithmetic sequence used for in the example?

• To find the sum of numbers

• To divide numbers equally

• To list multiples of a number

• To subtract numbers

What is the next step after listing the multiples of each number?

• Dividing the numbers

• Subtracting the numbers

• Comparing the lists to find the common multiple

• Adding the numbers

What is the least common multiple of 15 and 20 as demonstrated?

• 30

• 75

• 60

• 45

Which number is not a common multiple of 15 and 20?

• 120

• 60

• 90

• 30

What is the significance of the first common multiple found in the lists?

• It is the average of the numbers

• It is the least common multiple

• It is the sum of the numbers

• It is the largest common multiple