Understanding Least Common Denominator

The video tutorial explains how to rewrite fractions with a least common denominator by finding the least common multiple (LCM) of the denominators. It covers two methods: listing multiples and using prime factorization. The tutorial demonstrates converting fractions to have a common denominator, allowing for easy addition of fractions.

What is the primary reason for rewriting fractions with a least common denominator?

• To convert them into whole numbers

• To enable addition of the fractions

• To make them easier to compare

• To simplify the fractions

What is the least common multiple of 8 and 6?

• 18

• 30

• 12

• 24

Which method involves listing multiples to find the least common multiple?

• Prime factorization

• Subtraction method

• Listing multiples

• Division method

What is the prime factorization of 6?

• 2 x 2

• 2 x 5

• 2 x 3

• 3 x 3

Tags

CCSS.3.OA.A.3

How many 2's are needed in the prime factorization to be divisible by 8?

• One

• Three

• Four

• Two

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is 2/8 rewritten with a denominator of 24?

• 6/24

• 7/24

• 5/24

• 4/24

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

To convert 2/8 to a fraction with a denominator of 24, by what number do you multiply the numerator and denominator?

• 2

• 3

• 5

• 4

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is 5/6 rewritten with a denominator of 24?

• 21/24

• 20/24

• 19/24

• 18/24

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

To convert 5/6 to a fraction with a denominator of 24, by what number do you multiply the numerator and denominator?

• 2

• 3

• 5

• 4

Tags

CCSS.7.NS.A.1C

What is the final step after rewriting both fractions with a common denominator?

• Subtract the fractions

• Multiply the fractions

• Add the fractions

• Divide the fractions

Tags

CCSS.7.NS.A.1C