Understanding Fractions with Unlike Denominators

This video tutorial explains how to add fractions with unlike denominators by finding a common denominator. It covers the concept of the least common denominator and demonstrates how to use visual models to understand the process. The tutorial also explores alternative methods using non-least common denominators and emphasizes the importance of simplifying fractions. The video concludes with a summary of the key points discussed.

Why is it necessary to have a common denominator when adding fractions?

• To add fractions of different sizes

• To ensure the numerators are the same

• To add or subtract parts of the same size

• To make the fractions look similar

What is the least common denominator of 1/4 and 1/2?

• 2

• 6

• 4

• 8

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CCSS.3.NF.A.3B

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How do you convert 1/2 to have a denominator of 4?

• Multiply both numerator and denominator by 4

• Add 2 to the numerator

• Subtract 1 from the denominator

• Multiply both numerator and denominator by 2

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CCSS.4.NF.B.3C

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What is the sum of 1/4 and 2/4?

• 1/2

• 5/4

• 3/4

• 1

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CCSS.4.NF.A.1

CCSS.5.NF.B.5B

In the visual model, what does partitioning the rectangle into four equal parts demonstrate?

• That 1/4 is larger than 1/2

• That 1/4 is equivalent to 1/2

• That 1/2 is equivalent to 2/4

• That 1/2 is larger than 1/4

What is an alternative method to find a common denominator if the least common denominator is not known?

• Divide the denominators

• Multiply the denominators

• Add the denominators

• Subtract the denominators

What is the equivalent of 6/8 when simplified?

• 1/2

• 3/4

• 5/8

• 7/8

How can you simplify 6/8?

• Add 2 to the numerator

• Divide both numerator and denominator by 2

• Subtract 2 from the denominator

• Multiply both numerator and denominator by 2

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CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the result of adding 2/8 and 4/8?

• 8/8

• 7/8

• 6/8

• 5/8

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CCSS.5.NF.A.1

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What is the final simplified result of adding 1/4 and 1/2 using any common denominator?

• 3/4

• 7/4

• 1/2

• 5/4

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CCSS.5.NF.A.1

CCSS.5.NF.A.2