Adding Fractions with Unlike Denominators

The video tutorial demonstrates how to add two unit fractions with unlike denominators using fraction strips. It explains the process of aligning fraction bars and using trial and error to find a common denominator. The tutorial highlights the concept of a common denominator as a piece that fits into both fraction pieces being added. By using fraction strips, students can visually understand that 1/4 and 1/3 can be added to make 7/12 without complex calculations.

What is the first step when adding fractions using fraction strips?

• Divide the fractions

• Subtract the denominators

• Line the bars up side-by-side

• Multiply the numerators

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CCSS.5.NF.A.1

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When adding fractions, what do you need to find that fits both pieces?

• A common multiple

• A common numerator

• A common denominator

• A common fraction

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What method is suggested for finding the piece that fits both fractions?

• Subtraction

• Trial and error

• Division

• Multiplication

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Which fraction piece did the students realize fits into both one-third and one-fourth?

• Sixths

• Tenths

• Eighths

• Twelfths

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CCSS.4.NF.A.1

CCSS.5.NF.B.5B

How many twelfths are equivalent to one-fourth?

• 5

• 2

• 3

• 4

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How many twelfths are equivalent to one-third?

• 5

• 3

• 2

• 4

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What is a common denominator in the context of adding fractions?

• A piece that fits into both fraction pieces

• A piece that fits into one fraction piece

• A piece that fits into neither fraction piece

• A piece that fits into the larger fraction piece

What is the common denominator for one-fourth and one-third in this example?

• 12

• 10

• 8

• 6

What is the sum of one-fourth and one-third in twelfths?

• 8/12

• 5/12

• 6/12

• 7/12

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What is the benefit of using fraction strips to add fractions?

• It avoids subtraction

• It eliminates the need for division

• It provides a graphical representation

• It simplifies multiplication

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