Finding Least Common Multiple and Fractions

Mr. Buffington explains how to compare fractions using common denominators. The lesson covers finding the least common multiple (LCM) of denominators, converting fractions to have the same denominator, and comparing fractions by examining their numerators. The video includes examples and practice exercises to reinforce the concepts. Understanding these skills is essential for adding and subtracting fractions in future lessons.

What is the primary method discussed for comparing fractions?

• Using common denominators

• Using decimal conversion

• Using common numerators

• Using cross-multiplication

What does LCM stand for?

• Lowest Common Multiple

• Least Common Measure

• Least Common Multiplier

• Lowest Common Measure

How do you find the LCM of two numbers?

• By subtracting the numbers

• By dividing the numbers

• By adding the numbers

• By listing the multiples and finding the smallest common one

What is the LCM of 4 and 5?

• 25

• 10

• 15

• 20

Why is finding the LCM important for fractions?

• To convert fractions to decimals

• To simplify fractions

• To find a common denominator

• To find a common numerator

What is the LCM of 5 and 8?

• 40

• 45

• 35

• 30

How do you convert a fraction to have a common denominator?

• Subtract the LCM from the numerator

• Multiply the numerator by the LCM

• Multiply both numerator and denominator by the same number

• Add the LCM to the denominator

What is the result of converting 2/5 to have a denominator of 40?

• 8/40

• 16/40

• 20/40

• 24/40

What is the result of converting 7/8 to have a denominator of 40?

• 40/40

• 28/40

• 35/40

• 32/40

What is the first step in comparing fractions?

• Find the greatest common divisor

• Convert fractions to decimals

• Find the least common multiple

• Cross-multiply the fractions