Adding Fractions with Unlike Denominators Explained

In this video, Mr. J explains how to add fractions with unlike denominators. He provides two examples: adding four-ninths and one-third, and adding three-tenths and two-sixths. The process involves finding a common denominator, renaming the fractions, adding the numerators, and checking if the result can be simplified. Mr. J emphasizes the importance of finding the least common multiple to simplify calculations. The video concludes with a summary and links to additional resources for further learning.

Why do we need a common denominator when adding fractions?

• To convert fractions to decimals

• To simplify the fractions

• To make the denominators the same

• To make the numerators the same

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the least common multiple (LCM) of 9 and 3?

• 9

• 6

• 3

• 12

How do you rename the fraction 1/3 to have a denominator of 9?

• Multiply both numerator and denominator by 3

• Multiply both numerator and denominator by 2

• Multiply both numerator and denominator by 5

• Multiply both numerator and denominator by 4

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the sum of 4/9 and 3/9?

• 1/9

• 9/9

• 7/9

• 12/9

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the least common multiple (LCM) of 10 and 6?

• 40

• 30

• 20

• 50

How do you rename the fraction 3/10 to have a denominator of 30?

• Multiply both numerator and denominator by 3

• Multiply both numerator and denominator by 2

• Multiply both numerator and denominator by 4

• Multiply both numerator and denominator by 5

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

How do you rename the fraction 2/6 to have a denominator of 30?

• Multiply both numerator and denominator by 5

• Multiply both numerator and denominator by 2

• Multiply both numerator and denominator by 3

• Multiply both numerator and denominator by 4

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the sum of 9/30 and 10/30?

• 29/30

• 10/30

• 9/30

• 19/30

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the simplified form of 19/30?

• None of the above

• 19/30

• 9/15

• 38/60

What is the first step in adding fractions with unlike denominators?

• Convert fractions to decimals

• Add the numerators

• Find a common denominator

• Simplify the fractions

Tags

CCSS.7.NS.A.1C