Adding and Subtracting Fractions with Unlike Denominators

This video tutorial teaches how to add and subtract fractions with unlike denominators. It explains that you cannot simply add or subtract denominators and demonstrates how to find a common denominator by renaming fractions. The tutorial includes examples of both addition and subtraction, showing how to convert fractions to have the same denominator before performing the operation.

Why is it important to have a common denominator when adding or subtracting fractions?

• To ensure the pieces being counted are of the same size

• To make the numerators equal

• To make the fractions look more complex

• To change the value of the fractions

Tags

CCSS.7.NS.A.1C

When adding fractions with the same denominator, what do you do with the numerators?

• Divide them

• Multiply them

• Subtract them

• Add them

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the result of adding 2/6 and 1/2 if you incorrectly add both numerators and denominators?

• 3/12

• 3/6

• 3/4

• 3/8

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Why doesn't adding the denominators directly work when adding fractions with unlike denominators?

• It simplifies the fractions

• It makes the fractions equal

• It makes the fractions larger

• It changes the size of the pieces

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the common denominator for the fractions 2/6 and 1/2?

• 3

• 2

• 6

• 12

How do you express 1/2 as an equivalent fraction with a denominator of 6?

• Multiply by 6/6

• Multiply by 1/1

• Multiply by 3/3

• Multiply by 2/2

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the sum of 2/6 and 3/6?

• 1/6

• 5/6

• 4/6

• 6/6

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the first common multiple of 3 and 5?

• 15

• 10

• 20

• 25

How do you rename 2/3 as an equivalent fraction with a denominator of 15?

• Multiply by 3/3

• Multiply by 5/5

• Multiply by 15/15

• Multiply by 2/2

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What is the result of subtracting 6/15 from 10/15?

• 4/15

• 6/15

• 10/15

• 2/15

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D